1.38ct Oval Cut Natural Sapphire

Gemological report included

Mineral Corundum
Chem. Composition: Al2O3
Specific Gravity 4.00
Hardness 9
Refractive Index 1.762 – 1.770
Birefringence 0.008 – 0.010
Fluorescence Orangey red
Pleochroism vB-gB
Optic character Doubly refractive
Optic dispersion 0.018