Gemstone Type : Natural Blue Star Sapphire Approx. Weight (ct) : 1.05 Cts. Shape : Round Size/Dimension : 5.5 MM Depth : 3 MM Color : Blue Clarity : Translucent Luster : Good Origin : Thailand Hardness : 9 Specific Gravity : 3.9 - 4.1 Refractive Index : 1.76 - 1.78 Chemical Composition : Al203 Treatment : Natural