Precious beryl refers to all in that group that are not Aquamarine, Emerald. Beryl comes in a wide range of colours and is found in depsoits worldwide some of the better known varieties are Golden beryl, Goshenite, And also morganite because of this the colours also range widely as well as from opaque to transparent. Its mohls hardness is 7.5-8 with a refractive index of 1.562-1.602