PROPERTIES | Created Emerald (Biron type) Hydrothermal | Created Emerald (Gilson type) Flux melt | Natural Emerald |
Classification | Beryl | Beryl | Beryl |
Chemical Composition | Be3Al2Si6O18 | Be3Al2Si6O18 | Be3Al2Si6O18 |
Crystal System | Hexagonal | Hexagonal | Hexagonal |
Hardness (mohs) | 7.5-8.0 | 7.5-8.0 | 7.5-8.0 |
Specific Gravity | 2.70 | 2.65-2.70 | 2.65-2.70 |
Melting Point | 1,410∘C | 1,410∘C | 1,410∘C |
Transparency | Transparent | Transparent | Transparent |
Refractive Index | 1.570-1.577 | 1.563-1.568 | 1.565-1.598 |
Birefringence | 0.007 | 0.005 | 0.005-0.008 |
Average Dispersion | 0.014 | 0.014 | 0.014 |
Chelsea color filter | Bright red | Dark red/pink | Dark red/pink |
Inclusion | Liquidus, Solidus | Liquidus, Solidus | Liquidus, Solidus-liquidus |