Overall Dimension: 1.75 x 0.5 x0.25 inches; Back Type: Hook. SKU: e25160; Weight: 2.7g; Stone: 2 genuine coral; Material: Genuine Sterling Silver (925 silver, 92.5% silver content); Stamp: 925; The organic gem coral is the skeleton of coral polyps which live in the sea. Dull when harvested, it can be polished to a high shine. Red and pink varieties are generally found in warm Asian and Mediterranean waters. Coral has been carved in China for 2,000 years and was used medicinally and as an amulet in other ancient cultures. Sea bamboo is a vivid red gem from the coral family. Fossilized coral dates from the Ordovician period of prehistory and displays beautiful colors and a gorgeous starburst pattern when polished.