Physical properties of red coral (1)

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Physical Properties of Red Coral
Presented By- Coral.org.in
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Coral is a gemstone which is ruled by Mars. It
comes in many colors. It is also an organic
gemstone like Pearl. That is why the chemical
structure of Pearl and Coral is very similar
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It is found in Deep sea water. Red coral are
formed from organic, name Polyps.
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75 of worldwide production of Coral comes from
Italy. Italian Corals are considered to be the
finest. Other countries like Japan, Taiwan,
Australia also produce Corals. 
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Red coral gemstone contain Chemical Composition
CaC03 (Calcium Carbonate).
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The hardness of Red coral is vary from
Hardness Mohs scale 3.5-4.0.
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The one that are mainly used in jewelry are Red
coral, pink coral and white coral. Coral from
Japan are said to have "OX-BLOOD" red coral.
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Specific gravity of Red coral is lies between
2.60-2.70 and Refractive Index 1.486 - 1.658 .
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Birefringence Of red coral gemstone is 0.160.
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