| Mohs scale | |||
| Hardness | Name | Hardness Details | Memo |
| 1 | Sulphur | 1 - 1.5 |
easily scraped with a nail |
| 2 | Amber | 2 - 3 | scraped with a nail |
| Ivory | 2 - 4 | ||
| 3 | Pearl | 3 - 4 | scraped with a coin。 |
| Coral | 3 - 4 | ||
| Malachite | 3.5 - 4 | ||
| 4 | Rhodochrosite | 4 | easily scraped with a knife |
| 5 | Lapis Lazuli | 5- 6 | scraped with a knife |
| Turquoise | 5 - 6 | ||
| Opal | 5.5 - 6.5 | ||
| 6 | Moonstone | 6 - 6.5 | scraped with a steel file |
| Tanzanite | 6.5 - 7 | ||
| Peridot | 6.5 - 7 | ||
| Ｚｉｒcon | 6.5 - 7.5 | ||
| 7 | Citrine | 7 | scraped with a glass or harder stone. |
| Amethyst | 7 | ||
| Tourmaline | 7 - 7.5 | ||
| Garnet | 7 - 7.5 | ||
| Emerald | 7.5 - 8 | ||
| 8 | Topaz | 8 | scraped with a glass or harder stone. |
| Alexandrite | 8.5 | ||
| 9 | Ruby | 9 | scraped with a glass or harder stone. |
| Sapphire | 9 | ||
| 10 | Diamond | 10 | |