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Coral

Organic Gems
Coral is an organic gemstones. Most gemstones are formed from inorganic substances, but a number of gemstones are from organic sources, that is from living things, either plants or animals. Coral is the "skeleton" formed by the individual polyps, plant-like animals, which make up a colony.

Colours
Red and pink are the usual colours for coral, but white and black are also known.

Forms
Coral is usually polished en cabochon or into beads, but is also often carved.

You may wish to check the attributes of gemstones on our Gemstone Characteristics page.

Technical Details
Chemical Composition and NameCaCO3 - Calcium Carbonate
Hardness3.5
Refractive Index 
Specific Gravity2.6 - 2.7
Crystalline System 


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