Emerald gets its color out of chromium and vanadium, and belongs to the family of beryl.
Emerald is rarely completely unharmed on the surface because you will usually process the oil to hide flaws and enhance color.
In order to minimize the loss of material on emerald so usually step cut the so-called emerald-cut.
Emeralds are found in granite rock, pegmatite rock and slate.
Dom finest emeralds come from Colombia but also in countries such as Austria, Brazil, Zambia, Australia, etc..
Crystal Structure: Hexagonal
Composition: Aluminum beryllium silicate
Refractive index: 1.57 to 1.58