Gemstone Hardness Scale MOHS [With Table] | Gem .
The MOHS Hardness Scale starts with talc at 1 being the softest mineral and ending with diamond at 10 being the hardest mineral. It is universally used around the world as a way of distinguishing minerals. Simply put: the higher the number, the harder the mineral. 10. Diamond: 9. Corundum: 8. Topaz: 7. Quartz: 6. Feldspar: 5. Apatite: 4. Fluorite: 3. Calcite: 2. Gypsum: 1. Talc: The MOHS scale ...