Comparison Chart for Empress Cultured Emerald and Nature Emerald
|
|
Empress Cultured Emerald |
Natural Emerald |
| Hardness |
8 |
7.5 - 8 |
| Specific Gravity |
2.65 - 2.67 |
2.67 - 2.78 |
| Mineral |
Beryl |
Beryl |
| Crystal System |
Hexagonal |
Hexagonal |
| Composition |
Be3Al2Si6O18+Cr+3 |
Be3Al2Si6O18+Cr+3 |
| Refractive Index |
1.561 - 1.565 |
1.565 - 1.582 |
| Birefringence |
0.003 - 0.005 |
0.005 - 0.009 |