Item No : 405068 Gemstone Type : Natural Unheated Black Star Diopside Approx. Weight (ct) : 10.80 Ct. Shape : Oval Cabochan Size/Dimension : 16 x 11 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