Item No : 593515 Gemstone Type : Russain Color Changing Alexandrite Cats Eye Approx. Weight (ct) : 0.55 Ct. Shape : Oval Size/Dimension : 5.5 x 3.9 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