Emerald Gemstone (Hardness of 8.50)
Emerald, the green variety of Beryl, is the most famous and valuable green gemstone. Its beautiful green color, combined with durability and rarity, make it one of the most expensive gemstones. Deep green is the most desired color in Emeralds. In general the paler the color of an Emerald, the lesser its value. They are sometimes heat treated, which causes their color to turn blue Emerald, among the rarest of gems, are almost always found with birthmarks, known as inclusions. Some inclusions are expected and do not detract from the value of the stone as much as with other gemstones. However, you should look to make sure that fissures do not go too deep into the stone so that it might be weakened enough to break if it were hit accidentally. The fissures that are characteristic of emerald are traditionally filled with oil or resin to make them less visible to the eye. You should assume that your emerald has been improved in this way unless it has a laboratory certificate indicating otherwise: such rare stones command a considerable premium.
Emeralds have been synthetically produced since 1848. Synthetic Emeralds / Created Emeralds currently produced can be very similar to true, natural Emeralds to the point that they may be virtually indistinguishable by normal means. Here are some names for synthetic emerald to watch out for, Biron Emerald, Chathan Emerald, Kimberly Emerald etc. We ABC Stone also provide created emeralds on order basis.
The finest Emeralds are traditionally from Colombia, though Zambia has been a recent significant producer. Ancient Emerald sources were in Egypt and Austria. Important Emerald deposits are in Brazil, China, Afghanistan, Russia, Mozambique, South African, and the U.S. (North Carolina).
They are available in mm sizes and far sizes in shape of Round, Oval, Pear, Heart, Marquies, Trillion, Square, Octogun, Cushion, Cut Stones, Buff Tops, Cabs and Beads, Briolettes etc.