Gemstone Type : Natural Tourmaline Approx. Weight (ct) : 2.10 Cts. Shape : Oval Cabochan Size/Dimension : 5 x 4 MM Depth : 2.5 MM Color : Fancy Color Clarity : Transparent Luster : Good Origin : Africa Hardness : 7.5 Specific Gravity : 3.0+ Refractive Index : 1.62 - 1.68 Chemical Composition : Na(Li,al)3al6si6o18(Bo3)3(Oh)4 Treatment : Natural