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Wikipedia: Emeralds are a variety of the mineral beryl (Be3Al26) colored green by trace amounts of chromium and sometimes vanadium. Beryl has a hardness of 7.5–8 on the 10 point Mohs scale of mineral hardness. Most emeralds are highly included, so their toughness (resistance to breakage) is classified as generally poor.
![[The Chalk Emerald ring.]](http://upload.wikimedia.org/wikipedia/commons/8/86/National_Museum_of_Natural_History_Emeralds_3.JPG "The Chalk Emerald ring.")
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![[Left to right: The Indian Emerald Necklace, the Gachala Emerald crystal and the Mackay Emerald Necklace, all...]](http://images.ookaboo.com/photo/s/National_Museum_of_Natural_History_Emeralds_1_s.jpg "Left to right: The Indian Emerald Necklace, the Gachala Emerald crystal and the Mackay Emerald Necklace, all...")
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 from Jorfer |
from Jorfer |
![[The Hooker Emerald Brooch, containing a 75]](http://images.ookaboo.com/photo/s/Hooker_Emerald_Brooch_s.jpg "The Hooker Emerald Brooch, containing a 75")
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 from dbking |
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