Item No : 575419 Gemstone Type : Natural Unheated Black Star Diopside Approx. Weight (ct) : 7.30 Ct. Shape : Oval Cabochan Size/Dimension : 12 x 10 MM Color : Black Star 4 Rays Clarity : Opaque Luster : Good Origin : Africa Hardness : 5.5 Specific Gravity : 3.3 Refractive Index : 1.675 - 1.701 Chemical Composition : CaMg(Si206) Treatment : Natural Quantity : 1 Pc (s)