Item No : 4727942 Gemstone Type : Natural Kyanite Blue Sapphire Approx. Weight (ct) : 0.70 Ct. Shape : Oval Size/Dimension : 6 x 4 MM Color : Blue Sapphire Clarity : Transparent Luster : Good Origin : Africa Hardness : 7 Specific Gravity : 3.57 - 3.67 Refractive Index : 1.71 - 1.73 Chemical Composition : Al2SiO5 Treatment : Natural Quantity : 1 Pc (s)