Item No : 5646376 Gemstone Type : Natural Golden Black Star Sapphire Approx. Weight (ct) : 2.40 Ct. Shape: Oval Cabochan Size/Dimension : 8.3 x 6.2 MM Color : Golden Black Star 6 Rays Clarity : Opaque Luster : Good Origin : Thailand Hardness : 9 Specific Gravity : 3.9 - 4.1 Refractive Index : 1.76 - 1.78 Chemical Composition : Al203 Treatment : Natural Quantity : 1 Pc (s)