| Hardness (Mohs) | Mineral | Group |
| 8 | Londonite | |
| 8 | Painite | |
| 8 | Pezzotaite | Beryl |
| 8 | Spinel | |
| 8 | Topaz | |
| 8 - 8.5 | Musgravite | Magnesiotaaffeite |
| 8 - 8.5 | Taaffeite | Magnesiotaaffeite |
| 8.5 | Alexandrite | Chrysoberyl |
| 8.5 | Chrysoberyl | Chrysoberyl |
| 8.5 | Rhodizite | |
| 8.5 | Vanadium Chrysoberyl | Chrysoberyl |