Gemstone Type : Natural Kyanite Approx. Weight (ct) : 1.70 Ct. Shape: Pear Size/Dimension (LxHxW) : 8 x 6 x 3.5 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 : 100 % Natural