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Emerald is a member of mineral Beryl family Coloured Green. Emeralds are usually highly included so their toughness is poor.
The word of Emerald has come from the ancient Greek word "Esmaragdus".
As all other coloured gemstones, Emerald is also being graded using 4 Cs (colour, cut, clarity and carat) and normally, colour is the most important factor to evaluate the Gemstone, however about Emerald, Clarity is also a very important factor.
Generally, Emeralds with Verdant Green hue and high degree of transparency, are considered as the most valuable ones.
Emerald is the gemstone of May.