Natural Gemstones
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Choose Your Gemstone
Alexandrite – emerald green by day and ruby red by night
Alexandrite is truly a phenomenal gemstone: thanks to its fascinating property of iridescence, it offers an exciting spectrum of colors. This special feature makes alexandrite extremely popular as a piece of jewelry - at RENÉSIM we are happy to fulfill your individual wishes and create a very special alexandrite piece of jewelry for you personally.
The Alexandrite Effect – a distinctive play of colors in daylight and artificial light
The most characteristic feature of an alexandrite gemstone is its iridescence, i.e. it appears a different color depending on the lighting. While it appears emerald green to bluish green in natural daylight, this changes in artificial light or candlelight. The alexandrite then changes to its complementary color and takes on a ruby, raspberry or purple appearance - the technical term for this phenomenon, which also gave rise to the term " emerald by day and ruby by night ", is pleochroism . Deposits of chromium are responsible for its formation. Unfortunately, alexandrites with this pronounced effect and which exhibit intense iridescence are an absolute rarity. The first alexandrite deposit, the one in the emerald mines in the southern Ural Mountains, which was discovered in 1830, was a source of these rarities; however, it was exhausted within a few decades. In the case of alexandrites from other regions, such as Sri Lanka, the change in color is not as significant; there is only a color change between blue-green and violet. Fortunately, in 1987 a new source of very high-quality alexandrite gemstones was discovered in the city of Hematita in the Brazilian state of Minas Gerais.
Alexandrite and its Origin
Alexandrites were formed millions of years ago - the prerequisite was that two different types of rock containing aluminium, beryllium and chromium occurred together. This was only very rarely the case, which is why there are so few alexandrites today. When the first alexandrite gemstone was discovered in 1830, When it was discovered by the Finnish mineralogist Nils Gustaf Nordenskjöld (1792-1866), he named it after the future Tsar Alexander II (1818-1881). Thus, alexandrite became known in Russia under the name of the Tsar's gemstone.
Alexandrite and its other characteristics
Alexandrite is a variety of chrysoberyl, which is considered the third hardest mineral with a Mohs hardness of 8.5.
Many alexandrite gemstones have inclusions, but these do not reduce their value. Quite the opposite – they are proof that this is a unique natural product. Nevertheless, alexandrite gemstones that are as transparent and translucent as possible are sought after.
The Alexandrite Cat's Eye
A special feature are alexandrite cat's eyes, which are found mainly in Tanzania. Here, a continuous bright shimmering stripe can be seen on the surface. This optical phenomenon gets its name from the fact that such alexandrite is reminiscent of the slit-like eye of a cat sparkling in the dark.
You can find further information about Alexandrite on our detailed information page: Alexandrite – gemstone with changing color .
RENÉSIM and the large alexandrite selection
At RENÉSIM you can get Alexandrite either as a loose gemstone or in combination with a beautiful piece of jewelry. Simply choose your favorite from the many different Alexandrites. We offer you different types of cuts - such as round cut, oval cut, marquise cut and many more - as well as carat numbers and qualities to choose from. For example, would you prefer a 1-carat Alexandrite in a beautifully unusual marquise cut or perhaps a fascinating emerald cut?
Let yourself be enchanted by other colored gemstones at RENÉSIM. Whether it's aquamarines in seawater blue or a sapphire-blue tanzanite with purple reflections - you're guaranteed to find your favorite gemstone.
Aquamarine – a beautiful gemstone in the color of the sea
The color palette of aquamarine includes light blue, dark blue, blue-green and turquoise blue in different degrees of brightness. The most valuable is a clearly defined, intense blue. Very fine gemstones from a Brazilian mine in the state of Minas Gerais are known as Santa Maria aquamarine. They are characterized by their extremely intense blue. Similar beautiful color nuances are also found in Mozambique in Africa; they are called Santa Maria Africana in reference to their Brazilian relatives.
In aquamarines from other regions, such as Sri Lanka, the shimmer is not as significant; there is only a color change between blue-green and violet.
A special feature of aquamarine is its pronounced pleochroism : depending on the viewing angle, its colour varies between light blue and sky blue or between yellow-green and blue-green.
There are both translucent and opaque aquamarines. Completely transparent specimens are the most sought after. Gemstones with a cat's eye effect or star-shaped light phenomena are an exception to this rule. These optical effects are caused by certain deposits of foreign minerals in the crystal structure.
Individual jewelry designs with the aquamarine gemstone
At RENÉSIM, customization is our top priority! Simply tell us your personal wishes and ideas and we will implement them in your individual piece of jewelry with the best craftsmanship. Would you like a colored stone ring with an ocean blue aquamarine or an elegant necklace with matching timeless earrings ? Get in touch with us and share your ideas with us. This way, we can work with you to create your individual dream piece of jewelry with the gemstone and materials of your choice. The color of the aquamarine is particularly beautiful in the emerald cut. But we can also offer you other types of cut. You haven't found the aquamarine you are looking for? We are sure to find the gemstone that meets your wishes. Simply contact us by phone (+49 89 1222 893 0) or by email.
Further information about aquamarine can be found here: The aquamarine gemstone – water of the sea .
The garnet – a gemstone with many different varieties
The garnet group includes gemstones of different colors with a similar crystal structure and related chemical compositions. The main representatives are pyrope, almandine and spessartine in the so-called pyralpite series and grossular, andradite and uvarovite in the ugrandite series. Garnet is also often popularly called the red "carbuncle stone", although the gemstone has a much wider range of colors than just red.
Characteristics and color of garnet
The red varieties of garnet are generally the most well-known. The most important and popular gemstones are pyrope and almandine, which are red in color. But in addition to these gemstones, there are also green, yellow, orange, brown, black and colorless garnets. Only a blue garnet has not yet been discovered.
The name garnet comes from the Latin word "granum", which means "grain". Due to the round crystals or the similarity to the red flowers of the pomegranate tree, the name could also be derived from this plant. With a Mohs hardness of 6.5 to 7.5, garnet is one of the more robust gemstones. For this reason, it is very easy to work with, has a particularly beautiful brilliance and is therefore a popular gemstone. The gemstone has a transparency ranging from transparent to opaque and shines from crystal clear to resinous. It is also characterized by its high light refraction. Garnet crystals can weigh up to 700 kilos when unprocessed.
History of Garnet
Red garnets have been part of myths and stories for many centuries. They are already known in Greek mythology in the legend of Persephone's abduction by Hades. Their special and extraordinary luminosity is part of many Jewish and Muslim traditions. To this day, garnets symbolize light, but also loyalty.
It has been very popular as a gemstone for many years. The Vikings buried the dead with garnet jewelry to light the way to Valhalla, the destination of all brave, fallen warriors. Crusaders also wore garnets on their armor, under whose protection they felt safe, as the red gemstone represents power and passion. Pyrope in particular, whose name comes from the Greek and means "fiery" - characteristic of its color - was a real fashion gemstone in the 18th and 19th centuries.
The Garnet – a widely used gemstone
The term garnet encompasses over ten different groups of gemstones, all of which originate from different regions. However, most garnets for processing are discovered in Sri Lanka, South Africa and the USA.
The most valuable garnet, the demantoid, belongs to the andradite variety, which can be black, brown, yellow or green in color. This subgroup was named after the Brazilian mineralogist José Bonifácio de Andrada e Silva. The demantoid, whose name means "diamond-like shine", is green to emerald green and is found mainly in China, Italy, Korea, Namibia, Russia and the USA. It was first found around 1855.
Another special type of garnet is the rainbow garnet. It is an andradite with an opal-like shimmer and comes from Mexico. The so-called Spessartine, a garnet in orange to reddish brown, comes from Germany. The name of this variety refers to the location where it was found on the Rauhenstein peak northeast of Aschaffenburg in the Spessart. Other occurrences today include Brazil, Kenya, Madagascar, Pakistan and particularly fine varieties from northern Namibia.
Its different varieties
A long underestimated gemstone is the Malaya garnet, which is still only mined in one place today. The East African variety shines in an intense orange, sometimes mixed with pink. Its name also reflects the low appreciation in earlier times: the Swahili word "malaya" means "outcast". But since the 1970s, the Malaya garnet has been established, particularly on the American market.
Rhodolite is a beautiful red. It was discovered in 1882 by George Frederick Kunz in the state of North Carolina. He named it after the rhododendrons, which had a similar color. The currently highest quality type of rhodolite is the so-called raspberry rhodolite, which has extremely feminine red tones. Among connoisseurs, this gemstone is also called the "queen of garnets."
The tsavorite has a beautiful, shiny green color and was discovered by Campbell R. Bridges and named after the Tsavo National Park in Kenya. This gemstone is also found in Tanzania. Due to its color, the tsavorite is often compared to the emerald. In comparison, however, the green garnet is much rarer.
Individual garnet jewelry at RENÉSIM
Garnet is a particularly popular gemstone and is often worn in its red color. The gemstone is also the birthstone for the zodiac sign Scorpio.
At RENÉSIM you will get exactly the piece of jewelry you want. In our shop you can, for example, choose the popular halo ring with a red garnet . Or would you like a custom-made ring or a unique necklace with a green or yellow garnet? Your satisfaction is our top priority at RENÉSIM. You will receive exclusive advice from our competent service team. In a personal conversation, you tell us about your ideas and your unique piece of jewelry will be created. There are no limits to your creativity. If you have a very special request or would like to know more about the individual pieces of jewelry at RENÉSIM, simply contact us by phone ( +49 89 1222 893 0 ) or email.
If you want to know more about garnet, take a look at our information page: Garnet: A gemstone in far more colors than just red .
The Morganite – A gemstone in delicate pink tones
Morganite belongs to the beryl group and is a variety of noble beryl. This includes the color varieties of beryl that are not called emerald or aquamarine. Less commonly, this gemstone is also called pink beryl or rosterite because of its color.
Characteristics and Color of Morganite
The color range of morganite goes from pale pink to peach to violet, and salmon-colored gemstones can also be found. The pink shades that are characteristic of this beryl variety are due to the trace element manganese that it contains.
Inclusions are rarely found, and morganites are generally eye-clean. This means that no inclusions are visible to the naked eye at a distance of about 15 centimeters. With a Mohs hardness of 7.5 to 8, pink beryl is one of the more robust gemstones.
Another characteristic of morganite is what is known as pleochroism. The gemstones can show slight color changes under artificial light. They often shimmer from pale pink to bluish pink. Morganites with strong colors are particularly valuable, as intense colors are generally rare in this gemstone. It is most popular in intense pink.
The pink precious beryls are brittle. This means that they are susceptible to pressure, are insensitive to chemicals used in the home and have a lively glassy luster.
By firing at around 400°C, the color of inferior qualities can be improved. The color can also change due to sunlight and heat. Scientists know of apricot-colored morganites from Brazil that were exposed to sunlight for a week. Their color then changed to pink. The real color is only perceptible under neutral light. Under the light of energy-saving lamps or neon tubes, they appear in a completely different color.
The frequent discovery of morganite
The pink gemstone was first discovered in Russia at the end of the 19th century. At that time it was named Vorobieffite after the Russian mineralogist and scientist Vorobieff. At about the same time, also at the end of the 19th century, a Mr. Roster found pink beryl in Africa. Other names for the gemstone were rosterite, rose beryl or pink emerald.
The third "first discovery" of pink beryl followed at the beginning of the 20th century, which gave it its current name - morganite. The gemstones were found in the Pala pegmatites in southern California. The US gemologist Dr. George F. Kunz then named them morganite after the New York financial magnate and gemstone collector John Pierpont Morgan.
Another discovery was dated 1908 in Madagascar.
In mineralogy, a type locality is the place where a mineral was first scientifically described. For example, the Lipovskaya mine in Russia is defined as the type locality for vorobieffite, and the Pala area in San Diego County (USA) is defined as the type locality for morganite.
Origin of the Morganite Gemstone
The unique pink gemstones are increasingly found in Afghanistan, China, Madagascar, Mozambique, Namibia, Zimbabwe, Brazil and the USA (Utah, California). The best morganite finds in the world date back to the years between 1900 and 1927. They come from Anjanabonoina in Madagascar and are characterized by a deep rose-red color. Furthermore, the most spectacular and largest morganites to date were found in the Pala and Mesa Grande pegmatites in California. Impressive morganite crystals were also found in the US state of Maine; they are six meters long and weigh a total of one and a half tons. Aggregates weighing up to 177 tons were also discovered in Mozambique. A cut stone weighing 598.7 carats is on display in a museum in St. Petersburg, as is an uncut crystal from Madagascar weighing five kilograms.
Particularly attractive and uniquely beautiful pink beryls have also been found in Afghanistan since the early 2000s. They are particularly characterized by their perfection, color and size.
Individual designs at RENÉSIM
If the quality is very good, morganite is often used as a gemstone. Pure morganites in step cuts are particularly popular. Opaque stones tend to be cut round or oval.
We would be happy to work with you to create the jewel of your choice with the unique morganite stone in delicate rose, pink or peach colors. Whether in a marquise, drop or unusual heart cut, we have a large selection of unique and elegant morganites in many different color nuances. Choose your dream gemstone and have it set in a beautiful piece of jewelry. Would you like an unusual necklace with a morganite pendant or an individually designed colored stone ring ? We would be happy to advise you and work with you to design your dream unique piece.
You can also buy loose morganite from us. Choose your dream gemstone from our large selection. If you have any questions or a special request, just contact us by phone (+49 89 1222 893 0) or email.
At RENÉSIM you will of course only receive morganites of the highest quality, selected according to strict criteria.
If you would like to find out more, you can find further information here: Morganite – The gemstone in delicate pink tones .
The Peridot – a gemstone in various shades of green
A peridot is a gemstone that only comes in shades of green. It belongs to the group of silicates. It gets its color from the element iron, although the trace elements chromium or nickel can make the green appear even more intense.
To this day, the exact meaning of the name is uncertain. The name peridot may come from the Greek word "peridona," which means "to give abundance." This could refer to the large surface area of the green crystals. However, the name could also be derived from the Middle English word "peridote," meaning "bright spot" or "button." Another name for peridot is chrysolite, which translates into English as "goldstone." Due to its olive-green color, it is also called olivine. In the past, many stones of a similar color were also called chrysolite. Peridot is a particularly pure and transparent green type of olivine and, thanks to its beauty, is a popular gemstone.
Characteristics and Color of Peridot
Peridot only comes in green variants. The color palette ranges from light, pistachio-like yellow-green to olive green and a slightly brownish tone. Olivines are one of the few gemstones that only come in one color, so they are considered to be self-colored or idiochromatic crystals. The gemstones get their color from the element iron. They have a glass-like or oily shine and are transparent. Dark variants can be made lighter by heating. One of the most important identifying features is the gemstone's strong double refraction. This is noticeable because in particularly thick stones the doubling of the lower facet edges can be clearly seen with the naked eye through the polished table. With a Mohs hardness of 6.5 to 7, peridot is one of the more brittle stones. For this reason, it also tends to shatter if there is too much tension.
The peridot cat's eye and the star peridot are particularly rare. If the gemstone is cut in a cabochon style, the star peridot even shows a four- or even six-rayed shining star. These unique light effects are extremely rare and very sought after.
The Peridot – long forgotten
Peridot was first discovered 3,500 years ago near Egypt. In the historically most important deposit on the volcanic island of Zebirget (St. John's Islands) in the Red Sea, about 80 kilometers off the coast of Egypt, they were forgotten for a long time over the next few centuries before being rediscovered around 1900. Today, many olivines are also found in the serpentine quarries in Myanmar, Australia, Brazil, China and Pakistan, as well as in Eritrea, Kenya, Mexico, Sri Lanka, South Africa and Tanzania. The world's largest deposit is in the San Carlos Apache Reserve in the US state of Arizona. Deposits in Europe can be found in Norway, north of Bergen.
Crusaders brought peridot to Central Europe. The gemstone was often used for ecclesiastical purposes in the Middle Ages and was very popular as a gemstone. The green gemstones can still be admired today, for example in Cologne Cathedral. The peridots there weigh between 200 and 300 carats. For a long time, however, these were mistakenly thought to be emeralds. Olivine was also a favorite stone in the Baroque era. The green gemstone was also a highly valued gemstone among North American Indians, both in the past and today.
Special Peridot Deposits
The world's most beautiful peridots come from a mining area in the Suppat region of the Himalayas. The gemstones from the northwestern Pakistani part of Kashmir are also called Kashmir peridots and are particularly pure. The green color is extremely impressive. However, mining in this region is only possible from the end of June to September, which is why the supply of these unique gemstones is rather limited.
The largest cut peridot to date weighs 310 carats and comes from the Egyptian volcanic island of Zebirget and is now in the Smithsonian Institution in Washington, USA. In Russia there are also unique cut peridots that come from a meteorite that fell in Eastern Siberia in 1749.
The fascinating green of olivine continues to make it a highly sought-after gemstone. It is particularly popular in table and step cuts and – especially when set in gold – in the classic brilliant cut .
Peridot jewelry from your jeweler RENÉSIM
As already mentioned, peridot is considered extremely valuable and is therefore very popular in the jewelry world. It is also the birthstone of August. It was previously believed that it promoted friendship, freed one from the spirit of resentment and gave one greater eloquence.
At RENÉSIM you can get peridot either as a loose gemstone or in combination with a beautiful piece of jewelry! If you choose the loose version, you can choose your favorite from a variety of individual pieces - you can freely choose the carat number, cut and color. Do you want a ring with a peridot gemstone, but can't find one that meets your expectations? We create unique, custom-made pieces for you with great attention to detail. With us you are guaranteed to find the perfect colored gemstone for your dream piece of jewelry. Do you want individually made earrings with green colored gemstones or a necklace with a peridot pendant ? Find your perfect piece of jewelry with the unique green colored gemstone with the help of our team of experts. If you have any questions or a very special request, just contact us by phone ( +49 89 1222 893 0 ) or email.
At RENÉSIM you will of course only receive peridots of the highest quality, selected according to strict criteria.
You can find more information about this gemstone here: Peridot (Olivine) .
The classic Rubin
The ruby is one of the “Big 4” gemstones, along with diamond, emerald and blue sapphire. It is known for its warm, strong and unique red.
Its name is derived from the Latin word "ruber", which means the colour red. According to history, the ruby embodies passion, love and romance. The ancient Indians saw in it an everlasting inner fire that could grant a long life. In the Middle Ages, rubies were believed to bring luck in gambling and that they - like many other gemstones - had predictive powers. They supposedly darkened their colour when misfortune was imminent.
The ruby – a gemstone in the characteristic color ruby red
All red gemstones from the corundum mineral group - which also includes sapphires - are called rubies. The name ruby is derived from the Latin word for red, rubens, and in reference to the desirable gemstone, the name ruby red is used for an intense, deep red color.
The color palette in which a ruby can appear includes other shades that can have orange or pink undertones - the most valuable, however, is pigeon blood red with a slight blue shimmer.
The ruby and its unique color spectrum
The ruby is one of the most expensive and rarest gemstones - much rarer than the diamond. The pure red tones in particular are very limited and therefore very special. One optical phenomenon that can be observed in a ruby is so-called pleochroism. This means that a gemstone's color varies depending on the direction from which it is viewed. The ruby is only about eighty percent pure red and has a secondary tone of orange, pink or violet. The color range typical for a ruby therefore ranges from yellow-red to deep red.
The importance of the clarity and cut of a ruby
Colored gemstones are divided into three categories based on their degree of purity, with rubies being Type II, where internal inclusions are the norm. Clear rubies without inclusions are almost impossible to obtain. As with many gemstones, rubies are considered to be particularly valuable if they have the highest possible transparency. However, impurities are not to be equated with inferior quality, but can turn a ruby into an enchantingly beautiful, unique piece - provided they are not too large and conspicuous and do not have a negative impact on the durability of the gemstone.
The beauty of a ruby can only be truly brought out by a carefully and perfectly symmetrical facet cut.
Attractive lighting effects on a ruby
Due to inclusions in the form of rutile needles, rubies can exhibit certain light effects. Some rubies, for example, exhibit a cat's eye effect, which is characterized by a narrow, bright strip of light moving across the surface when the gemstone is moved.
In special cases, three lines intersecting at one point form the shape of a six-rayed star, an optical phenomenon called an asterism.
In addition, a surface shimmer can occur, in which the ruby has a silky shimmer.
Individual pieces of jewelry at RENÉSIM
At RENÉSIM you can get the ruby either as a loose gemstone or combined in an enchanting piece of jewelry. Whether oval cut, drop cut, round cut and many more - with us you get the gemstone in the cut and carat number of your choice, of course only in the best quality. Individuality is very important at RENÉSIM, which is why we do our best to fulfill even the most unusual wishes. Let yourself be inspired by our various designs of earrings , necklaces and bracelets and we will create an individual piece of jewelry with the ruby of your choice together with you. Take a look at our user-friendly diamond ring configurator and choose your favorite - combined with a colorful gemstone you give your piece of jewelry a very special touch.
You can find further information about the ruby on our detailed information page: The ruby - an extremely valuable gemstone .
The sapphire gemstone – from cornflower blue to the color of lotus flowers
When you hear the name sapphire, you first think of a deep blue gemstone. In fact, sapphires are particularly sought after when they have a vibrant, medium-light blue color without a gray veil, reminiscent of the beautiful appearance of cornflowers. The gemstone also comes in almost all other colors, except red. This is because sapphires and rubies both belong to the corundum group , with the red varieties being called rubies and all other colors being called sapphires.
The gemstone in the yellow-pink colour of lotus flowers is very exclusive – in technical terms it is called padparadscha, the Indian word for this flower.
A characteristic property of a sapphire is pleochroism, which means that the gemstone takes on different colors in the eye of the observer when viewed from different directions. The appearance of a blue sapphire can vary between a pure blue tone and a green-blue.
Sri Lanka and India – the sapphire and its most important deposits
Sri Lanka is known for being the site of sapphires, which have been found there since ancient times and are notable for their extremely beautiful blue-violet colour.
A sapphire in which a six-rayed star of light (asterism) can be seen or which, due to a narrow bright strip of light, is reminiscent of a cat's eye sparkling in the dark (chatoyance), is a special feature that can also be found in Sri Lanka.
The highest quality of these cornflower blue gemstones were found in the Indian region of Kashmir and even today the term Kashmir sapphire is synonymous with the highest quality. However, a sapphire from there is a rarity today as the deposits have long been exhausted.
The sapphire – its purity and its cut
In general, a sapphire is considered to be of high quality if it has a high degree of transparency and therefore sparkles enchantingly. An exception, however, are cloudy gemstones, which exhibit unusual optical effects such as chatoyance or asterisms.
The type of cut chosen for a sapphire depends largely on its purity. Light-flooded and translucent gemstones are faceted to accentuate their brilliance, whereas a star sapphire looks best with a smooth, outward-curving surface.
Individual sapphire jewelry at RENÉSIM
Sapphire is a particularly popular gemstone. At RENÉSIM you will find a variety of jewelry with sapphires in a wide range of colors, such as the earrings from our elegant Romance collection or the popular Prague ring with a deep blue sapphire.
However, we would also be happy to help you create your dream piece of jewelry with a sapphire in the color of your choice. In our large selection of loose gemstones, you are sure to find a sapphire in your favorite color and your preferred cut - whether it is a pear, antique, heart or emerald cut. If you still haven't found the right gemstone, please contact us. We will search for your personal jewel.
Choose your dream gemstone and have it set in a unique and personal piece of jewelry. Would you like an impressive necklace with a sapphire pendant or a sophisticated colored stone ring ? Talk to us and we will find your very own unique piece.
You can also buy loose sapphires from us. Choose your desired gemstone from the selection above. If you have any questions about our products or a very special request, just contact us by phone (+49 89 1222 893 0) or by email.
At RENÉSIM you will of course only receive sapphires of the highest quality and beauty, selected according to strict criteria.
You can find even more detailed information about sapphires on our information page: Sapphire. The gemstone of heaven .
The emerald – a gemstone in spring-like green
The most fascinating thing about an emerald is its beautiful green color, which even has its own color name, emerald green, and because of which the gemstone was chosen as the birthstone for the month of May.
The color is the most important criterion for the value of an emerald, with the highest reputation being a very intense and vibrant green without a gray veil and a medium color brightness. The most beautiful colored emeralds are those from Colombia, where this green is most clearly pronounced. Brazil is also an important source of good quality emeralds, even if these are usually a bit lighter than those from Colombia.
A characteristic feature of an emerald is its pleochroism, which means that the gemstone takes on different colors depending on the direction from which you look at it.
The Emerald and its History
The emerald has a long history. Emerald mines in Egypt, which may have existed as early as 3,500 BC, were only rediscovered in 1816 by the French mineralogist and explorer Frédéric Cailliaud. These mines in the eastern desert region probably supplied Europe with the precious minerals for more than a thousand years. But the Habachtal region in the Austrian state of Salzburg also produced one or two emeralds, and the discovery of Roman earrings also suggested that emeralds were found in the Mingora mine in Pakistan's Swat Valley.
Cleopatra's preference
The emerald, which like aquamarine belongs to the beryl mineral family, was already a popular status symbol in the time of the Egyptian pharaohs. Cleopatra already appreciated the gemstone with its unique color: she wore lavish emerald jewelry, decorated her home with them and gave emeralds with her image cut into them as gifts to dignitaries of her empire. The gemstones thus had great significance for the Egyptians - they were not only pretty to look at, but also patriotic symbols expressing national pride. For this reason, Cleopatra declared the impressive gemstone to be her property in her country around 47 BC. Since then, emeralds have been associated with fertility, immortality, rejuvenation and eternal spring.
The “Jardin” of an emerald – internal inclusions as fingerprints of nature
There is hardly a completely transparent emerald - impurities and cloudiness in the crystal structure are a characteristic of these gemstones. In terms of purity, they belong to type III, in which irregularities and small cracks are almost always found. These characteristics are referred to in emeralds as jardin (= garden) in reference to the French and characterize the individual appearance of each individual gemstone. The purity of an emerald is determined with the naked eye and not under the microscope as with diamonds .
However, since the numerous inclusions can have a negative effect on the material properties of an emerald, a special cut was developed for this gemstone: the rectangular emerald cut. This is particularly suitable for emeralds because it has bevelled corners and therefore there is no risk of the emerald, which tends to be brittle, being damaged in exposed areas.
The rare Trapiche emeralds from Colombia
Occasionally, an emerald can have special intergrowths of different crystals that look like six-spoked wagon wheels. What is special about this variety is that the Trapiche emerald grows in a hexagonal shape from the start and is not shaped into this form by a gem cutter. The name Trapiche is Spanish and can be translated as sugar mill.
The Brilliance of the Emerald
In addition to the inclusions, another characteristic property of the emerald is its unique brilliance. Silky, warm, soft or green fire - this is how the shine of this gemstone is often described and is significantly influenced by color, clarity and cut. The quality of the cut is particularly important for emeralds, as the inclusions in the emerald that are visible to the naked eye can be placed in such a way that the beauty of the gemstone is not impaired.
Individual designs with the emerald gemstone
At RENÉSIM, customization is a top priority! You can simply tell us your personal wishes and we will realize them with great joy and the best craftsmanship. Would you like to buy a colored stone ring , a beautiful necklace or enchanting earrings with the gemstone emerald? Let us share your ideas and visions and we will create an individual piece of jewelry with you using the gemstones and materials of your choice.
By the way, you can find further information about the emerald on our detailed information page: The emerald - a sought-after green gemstone .
Tanzanite – a rarity in the realm of gemstones
Tanzanite - a blue variety of the mineral zoisite - is one of the best-selling colored gemstones of all time. The reason for this is probably its unique blue tones - depending on the viewing angle and the incidence of light, the color appears blue, purple or brown-yellow. Its color spectrum ranges from deep sapphire blue to blue-violet to soft lavender and purple. The highly sought-after gemstone is a thousand times rarer than a diamond and is therefore an extremely valuable specialty.
Tanzanite does not have a particularly long history - after all, it was only discovered in 1967. But where does tanzanite come from? There is only one region in the world, just a few square kilometers in size, that produces it in the best gemstone quality: near the border area between Kenya and Tanzania at the foot of Kilimanjaro, not far from the city of Arusha. This also answers the question of where the name of this gemstone comes from - a creative variation on its country of origin, Tanzania. Although a Pakistani deposit is now known, the gemstones found there are nowhere near as high quality as those from Tanzania.
The Tanzanite and its exciting play of colors
The most beautiful tanzanites shine in a sapphire blue, which tends towards the violet of amethysts in artificial light. A special phenomenon of tanzanites is their so-called pleochroism or trichroism, which means that each tanzanite crystal has three colors: blue, a purple red and a greenish-yellow brown (bronze), with the intensity of the individual colors depending on the respective viewing angle. The larger the tanzanite, the more intense its color. The most sought-after color is a blue with a slight touch of purple. Smaller gemstones often still have brownish undertones - this is why most raw tanzanite stones are subjected to heat treatment, which makes the brown-yellow areas that often appear in the crystals disappear. At 550 degrees Celsius, this color turns to blue - a commercially available process that requires inclusion-free raw stones. This is precisely why tanzanites are very suitable for this treatment: they are usually eye-clean, meaning that there are no visible inclusions when viewed with the naked eye. The high degree of transparency and the absence of inclusions emphasize the magnificent colors of the tanzanite and are therefore trademarks of this colored gemstone. A slight color change effect can also be observed, because in daylight a high-quality tanzanite is ultramarine to sapphire blue, but in artificial light it is more amethyst-colored.
The already mentioned, extraordinarily high transparency contributes significantly to the great popularity of tanzanite and is particularly impressive in a faceted cut.
In principle, this gemstone is available in a wide range of different cuts - however, the oval and cushion cut are the most common in the world of tanzanite. But does this give the best possible effect? The beauty of your tanzanite is best shown off as a faceted piece of jewelry or as a cut cabochon . RENÉSIM offers you the exotic tanzanite in fascinating cuts - you will find your favorite here!
Tanzanite jewelry from your jeweler RENÉSIM
As already mentioned, tanzanite is considered extremely valuable and is therefore widely used in the jewelry world. This is precisely why tanzanite jewelry is a unique gift for a loved one. In addition, it is considered - alongside zircon and blue topaz - the birthstone of the month of December.
At RENÉSIM you can get tanzanite either as a loose gemstone or in combination with a beautiful piece of jewelry! If you opt for the loose version, you can choose your favorite from a range of individual pieces - with the carat number, cut and color of your choice. But how much do tanzanites cost? Tanzanites are very valuable due to their extremely good quality and impressive rarity. RENÉSIM offers you a diverse selection of the most beautiful gemstones - we are guaranteed to have the perfect colored gemstone for you too! We also create unique custom-made pieces: Find your favorite gemstone with us and our jewelry experts will develop a unique creation with you. With great attention to detail, sophistication and versatile craftsmanship, we realize even the most unusual idea - see our masterpieces for yourself and tell us your personal wish! For example, combine a beautiful gemstone - such as tanzanite, aquamarine or ruby - with a diamond ring model of your choice and the colorful, shiny stone is guaranteed to attract everyone's attention.
Thanks to long-standing, personal contacts in the jewelry industry, which have now been maintained in the 5th generation - including with the Tanzanite Foundation - we can pass on unique advantages such as excellent conditions to our customers. In order to make the online purchase of valuable jewelry as pleasant and safe as possible for you, we always offer you a 100% satisfaction guarantee. At RENÉSIM, your jeweler with a long family tradition, we promise you, among other things, a 14-day right of withdrawal, a tested payment system, competent and exclusive advice from the RENÉSIM service team and extremely secure shipping: Because you as the customer are not liable for any damage to your jewelry - RENÉSIM assumes full responsibility until you hold your package in your hands!
Find your perfect piece of jewelry with the unique blue colored gemstone with the help of our team of experts. The beauty, exclusivity and uniqueness in color, shine and appearance come at a price, but the tanzanite is more than worth it.
You can find more information about this gemstone here: Tanzanite – an extremely valuable blue gemstone .
Tourmaline – a multicolored mixed crystal
Tourmalines belong to the tourmaline group, a group of silicate minerals. The name of the gemstone comes from the Sinhalese. The word turamali means "stone with mixed colors". In keeping with this name, the gemstones of the tourmaline group exist in a wide variety of colors.
Characteristics and color of tourmaline
Tourmaline is available in more than 50 different shades of color - from colorless to pink, red, yellow, brown, green, blue and even black. The latter, however, are often gemstones with very high color saturation and a particularly dark green, blue or brown. The crystals usually combine different tones or different colors, but single-colored ones are quite rare. There are both translucent and opaque tourmalines. Among the many different varieties of tourmaline, the gemstones green tourmaline (verdelite) and red or pink tourmaline (rubellite) are particularly popular.
It was previously assumed that tourmaline could glow on its own. Today we know that the so-called pleochroism (multi-colouredness), which is characteristic of these gemstones, led to this assumption. This means that the stone shimmers in a different colour or with different intensities depending on the direction it is viewed from. Tourmaline cat's eyes come in various colours. However, the light strip is only really sharp in the green and pink varieties. The reason for this is fibrous inclusions of foreign crystals or thin hollow channels.
If the tourmaline is heated and then cooled again, the stone becomes electrically charged and attracts dust particles or small pieces of paper (pyroelectricity and piezoelectricity). The gemstone is then positively charged at one end and negatively charged at the other. In the Netherlands, electrically charged tourmaline was also used to clean pipes. The heated stones attracted tobacco ash. For a long time, tourmaline was therefore also called an ash puller. By heating the colored gemstones to 450 to 650°C, color changes are also possible. Green stones can take on an emerald color, reddish brown stones a bright red. Others are simply lightened by this. With a Mohs hardness of 7 to 7.5, tourmaline is one of the more robust gemstones
Green Tourmaline – a gemstone with healing properties
Experts call a green tourmaline "Verdelith". Verde stands for the green color of the gemstone in all its shades. Such a green gemstone can look dark brown from the side. Many tourmalines become darker when viewed from the tip. The green variation is said to make you patient. It is also said to promote openness and interest in other people. The unique stone is also said to help you keep track of things when making difficult decisions. Its radiance brings joy and clarity.
Green tourmaline is one of the most important healing stones of all – it is said to have healing effects on the psyche, soul and body.
The Tourmaline and its History
Tourmalines have been known in the Mediterranean region since ancient times, but it was not until 1703 that the Dutch brought them to Western and Central Europe. They called the often multi-colored, radiant gemstones with the Sinhalese word turamali - "stone with mixed colors". An old Egyptian legend says that the tourmaline must have passed over a rainbow on its way from the earth's interior and picked up its color there. This is where it is still called the "gemstone of heaven", which is still used today. Because the stone comes in many different shapes and colors, it was often confused with other gemstones in the past.
Origin of Tourmaline
Tourmaline can be found almost all over the world. In Europe, for example, on Elba (Italy) and in Ticino (Switzerland), but here the quantities and qualities are rather insignificant. The most important and largest supplier of tourmaline is Brazil. The Paraiba tourmaline from the Brazilian state of the same name is particularly sought after. The tourmaline gemstones with the incomparable, intense blue and blue-green color were only discovered in the late 1980s in a mine in the Brazilian state of Paraiba. In Africa, too, more and more tourmaline deposits are now being discovered.
Tourmaline jewelry and other uses of the gemstone
Particularly beautiful examples of the tourmaline gemstone are used in high-quality jewelry. In addition, the best in soccer receive a tourmaline award every year. For example, the championship trophy of the German soccer league is set with 21 tourmalines. The DFB Cup is also decorated with tourmaline gemstones. Tourmaline is the first crystal in which the pyroelectric effect was observed. Due to these special electrical properties, it is also used in electronics.
Individual designs with tourmalines
At RENÉSIM, customization is a top priority! You can simply tell us your personal wishes and we will realize them with great joy and the best craftsmanship. Would you like to buy a colored stone ring , a beautiful necklace or enchanting earrings with the gemstone tourmaline? Let us share your ideas and visions and we will create an individual piece of jewelry with you using gemstones and materials of your choice. Whether in the classic emerald cut, oval or teardrop shape, you will find a large selection of valuable tourmalines in many different colors. Simply contact us by phone ( +49 89 1222 893 0 ) or by email.
By the way, you can find further information about tourmaline on our detailed information page: Tourmaline - a gemstone in a wide variety of colors .
Zircon – a gemstone known since ancient times
The unique zircon consists of zirconium silicate and is a natural beauty. It comes in many different colors and has been known for several centuries. The gemstone is often confused with zirconia , which is artificially produced in the laboratory and is therefore far less valuable.
Characteristics and color of the zircon gemstone
Zircons have been known since ancient times, their name probably comes from Persian and means "golden". However, the gemstone's color palette includes much more - there are also colorless, brown, orange, red, violet, blue and even green zircons. In nature, gray-brown and red-brown zircons are the most common, while colorless ones are extremely rare.
With a Mohs hardness of 6.5 to 7.5, zircon is one of the more robust gemstones. Its characteristic feature is its so-called pleochroism , which is very weak in yellow zircons. The gemstones appear in the colors honey yellow to brown yellow. However, it is more evident in blue zircons - they appear yellow-gray to colorless. They have a glassy to diamond shine. The high light refraction and strong dispersion ensure great brilliance and intense fire. Zircons with a cat's eye effect are also known. The gemstones are very brittle and therefore sensitive to pressure and impact, and edges can be easily damaged.
By firing brownish zircons at temperatures between 800 and 1000 degrees, colorless and blue varieties can be artificially produced. However, these colors are not always permanent. UV rays and sunlight can also cause slight color changes. Zircon is known for its unique diamond-like sparkle, brilliance and fire.
History of Zircon
The gemstone has been known since ancient times and is mentioned in several ancient texts, including the Bible and a Hindu poem about the mythical Kalpa tree. Its leaves are said to have been made of zircon. A Jewish legend also says that an angel named "Zircon" watched over Adam and Eve in the Garden of Eden. The gemstone was also known as "hyacinth" in the past. This term is also mentioned several times in the Bible. At the end of the 10th century, the church writer Andreas, Bishop of Caesarea, assigned the twelve gemstones of the Heavenly Jerusalem, which included the zircon, to the apostles. Since then, the hyacinth has been a symbol of the apostle Simon.
Zircon has been found at some of the world's oldest archaeological sites. It is one of the most common gemstones and is found primarily in Cambodia, Thailand, Sri Lanka, Australia, Brazil, Korea, Madagascar, Nigeria, Tanzania and Myanmar.
Different zircon varieties
Ratanakiri is a Cambodian gemstone deposit and is known for producing some of the world's best specimens. The blue variety "Ratanakiri zircon" also comes from here. Other zircons were given their names because they are reminiscent of spices, such as the cinnamon and saffron zircon or the Kaduna zircon from Nigeria, which has a warm honey-yellow color. Yellow, yellow-red and red-brown gemstones are still called hyacinth today. The jargon is a straw-yellow to almost colorless variety. The blue variety Starlite was created by firing other zircons.
Colorless zircons are extremely rare, but their sparkle is particularly evident in the brilliant cut. These gemstones are often used as a substitute for diamonds .
special features of the gemstone
Zircons contain the radioactive elements uranium and thorium, which causes strong fluctuations in properties. Orange-red, brown, blue and transparent gemstones have the highest radioactive values and are also known as high zircons. Low zircons have the lowest physical values and are usually red-yellow, green and green-brown. The green medium zircons lie in between.
Individual zircon jewelry at RENÉSIM
Due to their great similarity to diamonds and their high dispersion, larger zircons are popular gemstones. Do you want an impressive ring with a unique gemstone or zirconium stud earrings ? At RENÉSIM you can get your personal dream piece of jewelry according to your ideas. Our service team will be happy to advise you on the selection of your individual piece of jewelry. Choose the precious metal that suits you best - whether platinum, white gold, rose gold or shiny yellow gold, your wishes are our top priority. Let your creativity run wild and develop your personal ring, a unique gemstone necklace or enchanting earrings together with RENÉSIM.
If you would like to know more about RENÉSIM’s individual pieces of jewellery or would like an initial consultation, simply contact us by phone ( +49 89 1222 893 0 ) or by email.
If you want to learn more about zircon, take a look at our information page: Zircon: A gemstone known since ancient times .
Unique customizations at RENÉSIM
Do you already have the piece of jewelry you want in mind, but you can't find it anywhere? Then you've come to the right place: RENÉSIM specializes in unique, custom-made pieces - share your ideas with us and together with our competent team we will realize even the most unusual wishes. With great attention to detail, sophistication and versatile craftsmanship, we turn initial design drafts into sophisticated creations that completely meet your expectations. See for yourself the RENÉSIM masterpieces - be inspired by a wide variety of designs and find out more about the beautiful custom-made pieces themselves and their creation process. For example, combine our enchanting Flowers Ring in rose gold with five faceted alexandrite gemstones and a sparkling diamond as the "center" of the flower - this is how you create your very own personal and individual alexandrite ring. Since we at RENÉSIM place great value on individuality, you can choose a piece of jewelry of your choice and we will create unique alexandrite jewelry with your chosen gemstone. There are no limits to your ideas and creativity. Take a look at our beautiful diamond rings in the RENÉSIM configurator, which also look enchanting with a colored gemstone. Of course, all of our prêt-à-porter models - whether rings, pendants or earrings - can be made with gemstones of your choice. Contact our competent service team without obligation and let us know your wishes.
The RENÉSIM responsibility: 100% satisfaction guarantee
At RENÉSIM, we have made it our mission to always give you a 100% satisfaction guarantee. We promise you a right of withdrawal of up to 14 days, competent and personal advice from an expert from the RENÉSIM service team, the highest quality with the best service , free ring size adjustment, secure payment systems and free shipping from Munich, which does not involve any risks for you - because we assume liability for your piece of jewelry until you hold it in your hands.
