What Are the Chemical Physical and Optical Properties of Natural Gemstones?

Answer

The physical, chemical and optical properties of natural gemstones vary depending on the type of stone. Diamonds are formed from pure carbon, have a hardness rating of 10 and their refractive index is high. Emeralds are formed from beryllium-aluminium-silicate, are green in colour and have a hardness rating of 7.9-8. Rubies are formed from corundum, red in colour and have a hardness rating of 9. Sapphires are blue, made of corundum and have a hardness rating of 9. Amethytes are formed from quartz, violet and have a hardness rating of 7.
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Visit this USGS site to find out the chemical formulas of natural gemstones.
http://www.nhvweb.net/nhhs/Science/apetock/Gemston...
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What Are the Chemical, Physical & Optical Properties of Natural Gemstones?
There are more than 40 popular varieties of gemstones, lists the International Colored Gemstone Association. Among these are gemstones often used in jewelry, including diamonds, emeralds, rubies, sapphires and amethysts. Behind the rich color of the... More »
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