Gemstone Type : Natural Blue Sapphire Approx. Weight (ct) : 0.50 Cts. Shape : Oval Cut Size/Dimension : 5 x 4 MM Depth : 2 MM Color : Blue Clarity : Translucent Luster : Good Origin : Srilanka Hardness : 9 Specific Gravity : 3.9 - 4.1 Refractive Index : 1.76 - 1.78 Chemical Composition : Al203 Treatment : Natural