Gemstone Type : Natural Color Changing Alexandrite Cats Eye Approx. Weight (ct) : 0.60 Ct. Gemstone Shape: Oval Cabochan Gemstone Size : 4.5 x 4 MM Gemstone Depth : 2.5 MM Gemstone Color : Green Purple Gemstone Clarity : Translucent Gemstone Luster : Good Gemstone Origin : Srilanka Gemstone Hardness : 8.5 Specific Gravity : 3.2+ Refractive Index : 1.742 - 1.749 Chemical Composition : BeAl2O3 Treatment : 100% Natural