Gemstone Type : Natural Red Star Ruby Approx. Weight (ct) : 3.80 Cts. Shape : Oval Cabochan Size/Dimension : 9 x 8 MM Depth : 4 MM Color : Red Star Clarity : Opaque Luster : Good Origin : India Hardness : 9 Specific Gravity : 3.9 - 4.1 Refractive Index : 1.76 - 1.78 Chemical Composition : Al2O3 Treatment : Natural