Gemstone Type : Natural Moonstone Approx. Weight (ct) : 21.20 Ct. Shape: Oval Cabochan Size/Dimension (LxHxW) : 16.5 x 14 x 12.5 MM Color : Gray Clarity : Translucent Luster : Good Origin : India Hardness : 6 Specific Gravity : 2.64 - 2.68 Refractive Index : 1.533 - 1.552 Chemical Composition : KAlSi3O8 Treatment : 100% Natural