Item No : 4711308 Gemstone Type : Natural Burma Gray Blue Star Sapphire Approx. Weight (ct) : 5.80 Ct. Shape : Oval Cabochan Size/Dimension : 9 x 8 MM Color : Gray Blue Clarity : Opaque Luster : Good Origin : Africa Hardness : 9 Specific Gravity : 3.9 - 4.4 Refractive Index : 1.76 - 1.81 Chemical Composition : Al206 Treatment : Natural Unheated Quantity : 1 Pc (s)