Item No : 759537 Gemstone Type : Russain Color Changing Alexandrite Cats Eye Approx. Weight (ct) : 0.80 Ct. Shape : Oval Size/Dimension : 4.5 x 5 MM Color : Green With Purple Clarity : Translucent Luster : Good Origin : Russain Hardness : 8.5 Specific Gravity : 3.2+ Refractive Index : 1.742 - 1.749 Chemical Composition : BeAl203 Treatment : Natural