CORAL

This organic gem material is made of the remains from skeletons of marine animals, which are known as coral polyps. These tiny creatures live in colonies forming branch structures as they develop finally forming coral reefs and atolls. Raw coral looks dull when it is unpolished. After working on it, it gives a vitreous luster. Coral is sensitive to heat and acids and can fade with wear. Though it is found in red, pink, white and blue varieties, red coral is considered to be the most valuable of all. The most precious coral is found in warm waters. Japanese coral is red, pink or white. Other localities for red and pink coral are found on the Mediterranean and African coasts, the Red Sea and the waters off Malaysia and Japan. Golden and black coral is found off the coasts of the West Indies, Australia and the Pacific Islands.

Crystal Structure: Trigonal

Hardness: 3-4

Specific Gravity: 2.68

Refractive Index: 1.49-1.66

Colors: Red, pink, white, blue, golden and black.

Luster: Dull to vitreous

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