Item No : 8593538 Gemstone Type : Natural Mother Of Pearl Approx. Weight (ct) : 14.65 Cts. Shape : Oval Cabochan Size/Dimension : 22 x 15 MM Depth : 5 MM Color : Rainbow Clarity : Opaque Luster : Good Origin : Thailand Hardness : 3 - 4.0 Specific Gravity : 2.60 - 2.78 Refractive Index : 1.52 - 1.66 Chemical Composition : Calcium Carbonate with water & conchilion Treatment : Natural