
What are gemstones?
Most gemstones, like diamonds, are minerals. They are formed under high pressure, at high temperatures and at great depths.
Gemstones are very rare and therefore extremely sought after. Each gemstone is unique and impresses with its own individual beauty - thus gemstones are sought-after applications for individual and unique pieces of jewelry.
Quality factors

Flowers Collection | Cocktail Ring

colored stone rings | Tanzanite

Romance Collection | Earrings
A selection of valuable gemstones at a glance



What are jewels and what are colored stones?
In the broadest sense, every piece of jewelry is a jewel . In the narrower sense, however, only those pieces of jewelry made of high-quality precious metals that are set or decorated with one or more gemstones are called jewels. Cut gemstones without a setting are also often referred to as jewels.
Colored stones (today also "colored gemstones") are basically all gemstones - including non-colored ones - except diamonds. There are numerous different gemstones that are found in a wide variety of countries around the world. Discover the most well-known gemstones in our extensive RENÉSIM gemstone lexicon .
The religious significance of the gemstone
Gemstones can be found in most world religions.
In both Judaism and Christianity, certain objects have always been set with precious stones. In other major religions, too, precious stones are used to decorate buildings, statues or equipment.
Especially in Buddhism and Hinduism, numerous deities are depicted in precious metals and decorated with gemstones.
The gemstone as an investment
Of all gemstones, diamonds with a GIA certificate are the best investment. In some cases, special and rare rubies, sapphires, emeralds and a few rare colored gemstones are also suitable, but these only have an expert opinion from an independent certification institute.
If you are interested in gemstones for asset protection, we would be happy to help you. Contact us!

Buy gemstones at RENÉSIM
RENÉSIM purchases the gemstones directly from global mining and cutting companies and can therefore provide you with any gemstone, no matter how unusual. For the RENÉSIM jewelry collections, our designers use only the most select gemstones, which give the jewelry its special shine.
Please feel free to contact us and we will create a completely individual, unique piece of jewelry for you that will showcase the gemstone of your choice in a special way.
Unique gemstones from RENÉSIM
Learn more about Ametrine - a mixture of Amethyst and Citrine.
AmetrineAlexandrite is particularly known for its "shimmering" properties. Buy Alexandrite
alexandriteFind out about the violet gemstone amethyst from the quartz group.
amethystDiscover the water-colored gemstone. Buy aquamarine
AquamarinLearn more about the conch pearl, one of the rarest natural pearls.
Conch PearlMore about chrysoberyl with its cat's eye effect (chatoyance).
chrysoberyl cat's eyeDiscover the lemon yellow gemstone from the quartz group.
citrineFind out more about the diamond, the king of gemstones. Buy diamond
diamondFind out about the different colors of garnet. Buy garnet
garnetFind out more about diopside from the mineral class of silicates here.
diopsideLearn more about the gemstone with the warm, fiery orange-red color.
fire opalDiscover hematite – a gemstone with dark colors.
hematiteLearn more about the shiny, light pink gemstone kunzite.
kunziteFind out more about iolite, a violet-blue variety of cordierite.
iolite (cordierite)Learn more about jade, a group of the minerals jadeite and nephrite.
jadeLearn more about the ultramarine blue gemstone lapis lazuli.
lapis lazuliDiscover morganite, a gemstone in delicate shades of pink. Buy morganite
MorganiteLearn more about the green gemstone malachite from the class of carbonates.
malachiteMore about the moonstone with its special bluish-white shimmer.
moonstoneDiscover the black chalcedony or the black and white agate.
onyxLearn more about the variations of opal (e.g. precious opal, semi-opal, fire opal) here.
opalMore about the mostly yellow or olive green periodite (olivine). Buy periodite
Peridot (Olivine)Find out more about this beautiful pearl, a rarity in nature.
pearlMore about the purple solid solution between pyrope and almandine.
RhodoliteFind out about the gemstone Rubellite, which belongs to the tourmaline group.
RubelliteFind out more about this top-class blue gemstone here. Buy sapphire
sapphireDiscover the famous "emerald green" gemstone. Buy emerald
emeraldDiscover the variations of the ruby-like spinel. Buy spinel
spinelMore about the star sapphire, a sapphire with an asterism.
star sapphireFind out more about the South Sea pearl, the largest and most well-known type of pearl.
South Sea pearlsFind out more about Tahitian pearls with their very special shimmer here.
Tahitian pearlsFind out more about the valuable blue tanzanite here. Buy tanzanite
TanzaniteMore about the tiger eye, whose appearance is reminiscent of the eyes of a big cat.
tiger eyeLearn more about topaz, a gemstone that comes in a variety of colors.
topazDiscover the special gemstone tsavorite from the garnet family.
tsavoriteLearn more about the sky blue, blue or apple green gemstone turquoise.
TurquoiseFind out about the colors of tourmaline. Buy tourmaline
TourmalineDiscover the famous diamond-like gemstone. Buy zircon
ZirconLearn about cubic zirconia, an affordable alternative to diamonds.
zirconiagemstone jewelry
gemstone c/en/collections/earrings (opens a new window)uts
Optical Effects in the Lexicon