Gemstone Type : Natural Color Change Alexandrite Cats eye Approx. Weight (ct) : 0.90 Cts. Shape : Round Cabochan Size/Dimension : 5.00 MM Depth : 3.5 MM Color : Green With Purple Clarity : Translucent Luster : Good Origin : Srilanka Hardness : 8.5 Specific Gravity : 3.2+ Refractive Index : 1.742 - 1.749 Chemical Composition : BeAl203 Treatment : Natural