Item No : 694435 Gemstone Type : Natural Kyanite Blue Sapphire Approx. Weight (ct) : 3.60 Ct. Shape : Oval Size/Dimension : 11 x 7 MM Color : Blue Clarity : Translucent Luster : Fair Origin : Africa Hardness : 7 Specific Gravity : 3.57 - 3.67 Refractive Index : 1.71 - 1.73 Chemical Composition : Al2Si05 Treatment : Natural