Item No : 758569 Gemstone Type : Natural Green Emerald Approx. Weight (ct) : 0.85 Ct. Shape : Oval Size/Dimension : 7 x 5 MM Color : Green Clarity : Translucent Luster : Good Origin : Colombia Hardness : 7.5 Specific Gravity : 2.67 - 2.84 Refractive Index : 1.56 - 1.59 Chemical Composition : Be3Al2(Si03)6 Treatment : Unheated