Hardness  : 2.5 - 4
Gravity  :  2.4 – 2.7
Reflection  : 1.65/1.49 drf
Color  :  Reddish Orange
Chemical formula  : CaCo3

It is composed chiefly of calcium carbonate. This is arranged as fibres radiating from the central axis of the curving coral branches. Its specific Gravity is 2.68 and hardness is less than 4 on the Moh's scale. It is an opaque stone. Many forms of coral exist but only high quality Red, Pink, Blue, Black and white corals are used in jewellery.

Corals are found in India, Italy, Australia, Sri Lanka, Japan, Malaysia, South, Africa, Algeria and U.S.A.

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