Weight: 2.90 Cts. Gem Type : Natural Unheated 6 Rays African Red Star Ruby Gem Shape: Oval Cabochan Gem Size: 8 x 6 mm Depth: 5 mm Color: Red Star Clarity: Opaque Luster: Good Hardness: 9 Specific Gravity: 3.9 - 4.1 Refractive Index: 1.76 - 1.78 Chemical Composition: AI203 Africa Unheated