gemstones from the sea
Coral is a gemstone of organic origin. Only the solid and stable, branch-like calcareous framework of a stony coral is suitable for processing into jewelry. Its individual branches can reach a length of between 20 and 40 cm and a diameter of up to 6 cm.
They usually grow at depths of between 3 and 300 meters in warm sea water, but there are also deep-sea corals that grow 2,000 meters below sea level. The coral is mined mainly in tropical areas, including the Mediterranean, the Red Sea, Japan and Hawaii.
The Coral and its Properties
In its untreated state, the coral has a matte surface; only through polishing does it acquire its typical glassy shine.
There are different colored varieties - however, the most popular for jewelry is the precious coral, which is characterized by its color in shades of red and pink. Depending on the color nuance, other names are common. The orange to pale red and medium red corals are called Momo. They are mainly found north of Taiwan, where the deep red Moro coral also comes from. The medium to dark red Sardegna coral grows mainly in the Mediterranean region.
A very special type is called angel skin coral - it is characterized by its light pink color with white and reddish areas. The most precious variety is the intensely red colored Aka coral thanks to its very shiny surface. It is mined near Japan.
White coral from the area around Taiwan is also enjoying increasing popularity.
Since coral is an organic gemstone, it is relatively sensitive and requires careful handling. It should not come into contact with acids or be exposed to excessive heat.
The History of Coral as a Gemstone
Coral was already valued as a gemstone in early history. The oldest piece of jewelry to date was found in Turkey and is said to date from around 7,500 BC. In ancient times, amulets were made from it, and in the Middle Ages, rosaries made from this gemstone became popular.
Today, coral is often cut into small pearls or cabochons . It is also common to make small sculptures from it.
Coral and other colored gemstones at RENÉSIM
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