Emerald-gemstone

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
gemstone.Deep green is the most desired color in emeralds. in general the paler the color of an emerald, the lesser its value.very pale colored stones are not called emeralds but rather "green beryl" . They are sometimes heat treated which causes their color to turn blue and transform into Aquamarine.the person who born in May use this as birth stone.its symbol of love .





Chemical Formula: Be/3Al/2SiO/6

Color                    :  Green

Hardness              : 7.5-8

Crystal system      : Hexagonal

Refractive index   : 1.57-1.58

SG                        :  2.6-2.8

Transparency        : Transparent to Translucent

Double Refraction: .006

Luster                   :  Vitreous

Cleavage              :  3,1

Mineral Class       :  Beryl

Sources: 
               
              Important Emerald deposits are in Brazil,China,Afghanistan,Russia,Mozambique,South African, and the U.s