Color Change Sapphire Weight: 1.35 CT. Size: 6.2x5.7 mm Shape: Oval Cut Color: Change Yellow To Hot Orange Clarity: Slight Inclusion Luster: Astonishing Origin: Africa Hardness: 9 Specific Gravity: 3.9 - 4.1 Refractive Index: 1.76 - 1.78 Chemical Composition: Al2O3, Aluminum Oxide Crystal Structure: Trigonal