Mineral | Corrundum |
---|---|
Chemistry | Al2O3 |
Color | Light - Deep Blue |
Refractive Index | 1.762 - 1.770 |
Birefringence | 0.008 - 0.010 |
Specific Gravity | 4.00 |
Mohs Hardness | 9.0 |
4.99ct - 11x9mm (BS0165)
3.07ct (BS0162)
1.08ct - 7x5mm (BS0161)
3.59ct - 9x7mm (BS0149)
2.00ct - 6mm (BS0112)