| Stone | Hardness (Mohs) |
| Alexandrite | 8.5 |
| Amethyst | 7.0 |
| Andalusite | 7.0-7.5 |
| Aquamarine | 7.5-8.1 |
| Citrine | 7.0 |
| Diamond | 10.0 |
| Emerald | 7.5-8.0 |
| Garnet | 7.0-7.5 |
| Tsav. Garnet | 7.0-7.5 |
| Iolite | 7.0-7.5 |
| Jade | 6.5-7.0 |
| Lapis | 5.0-6.0 |
| Moonstone | 6.0 |
| Morganite | 7.5-8.0 |
| Opal | 5.0-6.5 |
| Pearl | 2.5-4.5 |
| Peridot | 6.5-7.0 |
| Ruby | 9.0 |
| Sapphire | 9.0 |
| Spinel | 8.0 |
| Tanzanite | 6.5 |
| Topaz | 8.0 |
| Tourmaline | 7.0-7.5 |
| Zircon | 6.5-7.5 |
