Color : Golden yellow, green-yellow, brown 
Color of streak: White
Mohs� hardness : 8.5
Specific gravity : 3.70-3.72   
Cleavage : Imperfect 
Fracture: Weak ; conchoidal 
Crystal system : Orthorhombic
Chemical composition : Beryllium aluminium oxide
Refractive index : +0.011 
Flourescence : Usually none; green : weak ; dark red

Chrysoberyl has been known since very early times. Today the varieties alexandrite and chrysoberyl cat�s eye are especially valued. Deposits of chrysoberyl cat�s eye are especially found in Brazil (Minas Gerias, Minas Novas) and Sri Lanka ; also in Upper Burma, Malagasy Republic, Rhodesia and Russia (Urals). Stones are fashioned mainly in emerald, Ceylon and brilliant cuts. The famous Hope chrysoberyl, a light green stone of 45ct is completely clean.