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Hardness Scale
GEM | HARDNESS | ABSOLUTE HARDNESS |
|---|---|---|
| Diamond | 10 | 1600 |
| LustouR | 9.5 | 800 |
| Moissanite | 9 | 400 |
| Ruby | 9 | 400 |
| Sapphire | 9 | 400 |
| Cubic Zirconia | 8.5 | 300 |
| Alexandrite | 8.5 | 300 |
| Topaz | 8 | 200 |
| Spinel | 8 | 200 |
| Emerald | 8 | 200 |
| Aquamarine | 8 | 200 |
| Morganite | 7.5 | 150 |
| Tourmaline | 7.0 - 7.5 | 100 - 150 |
| Iolite | 7.0 - 7.5 | 100 - 150 |
| Amethyst | 7 | 100 |
| Smoky Quartz | 7 | 100 |
| Quartz | 7 | 100 |
| Ametrine | 7 | 100 |
| Kunzite | 7 | 100 |
| Citrine | 7 | 100 |
| Aventurine | 7 | 100 |
| Zircon | 6.5 - 7.5 | 86 - 150 |
| Garnet | 6.5 - 7.5 | 86 - 150 |
| Tanzanite | 6.5 - 7.0 | 86 - 100 |
| Peridot | 6.5 - 7.0 | 86 - 100 |
| Agate | 6.5 - 7.0 | 86 - 100 |
| Onyx | 6.5 - 7.0 | 86 - 100 |
| Chalcedony | 6.5 - 7.0 | 86 - 100 |
| Moonstone | 6.0 - 6.5 | 72 - 86 |
| Fire Opal | 5.5 - 6.5 | 60 - 86 |
| Opal | 5.5 - 6.5 | 60 - 86 |
| Pocket Knife | 5.5 | 60 |
| Turquoise | 5.0 - 6.0 | 48 - 72 |
| Tooth | 5 | 48 |
| Glass | 4 | 21 |
| Malachite | 3.5 - 4.0 | 15 - 21 |
| Coral | 3.0 - 4.0 | 9 - 21 |
| Penny | 3.5 | 15 |
| Pearl | 2.5 - 4.0 | 6 - 21 |
| Fingernail | 2.2 - 2.5 | 4 - 6 |
| Amber | 2.0 - 2.5 | 3 - 6 |
| Pencil Lead | 1 | 1 |
METAL | HARDNESS | ABSOLUTE HARDNESS |
|---|---|---|
| Tungsten Carbide | 9 | 400 |
| Vitalium | 9 | 400 |
| Ceramic | 9 | 400 |
| Stainless Steel | 7.0 - 8.0 | 100 - 200 |
| Rhodium | 6 | 72 |
| Titanium | 6 | 72 |
| Paladium | 5 | 48 |
| Zirconium | 5 | 48 |
| Cobalt | 5 | 48 |
| Serinium | 5 | 48 |
| Steel | 4.0 - 4.5 | 21 - 34.5 |
| Platinum | 4.0 - 4.5 | 21 - 34.5 |
| Iron | 4 | 21 |
| 10K Gold | 4 | 21 |
| 14K Gold | 3.0-4.0 | 9 - 21 |
| Brass | 3 | 9 |
| 18K Gold | 2.75 | 7.5 |
| Silver | 2.5 - 3.0 | 6 - 9 |
| 24K Gold | 2.5 | 6 |