Item No : 4673610 Gemstone Type : Natural Golden Black Star Sapphire Approx. Weight (ct) : 5.05 Ct. Shape: Oval Cabochan Size/Dimension : 10 x 9 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)