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Emerald fact file
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Crystal Structure: hexagonal
Chemical Composition: Beryl - silicate of Beryllium and Aluminum Al2Be3(Si6O18)
Hardness: 7.5 to 8 MOHS
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Refractive Index: 1.57 to 1.60
Colors: light to dark green
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Emerald, the green beauty of the gem world, is the May birthstone.
This beryl
with traces of chromium, is said to increase both intelligence and strength of
heart. Cleopatra was a great fan of emerald and so were the moghuls of India.Fine
emeralds are probably among the rarest of gems. They are probably rarer than fine
diamonds
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