Source: http://gemologyonline.com/mohs.htmlMohs Scale was developed in 1812 by German mineralogist Friedrich Mohs
(1773-1839)
Mohs Scale of hardness is a RELATIVE scale, not proportional. I mean by this that a mineral with the hardness of 8 will NOT be twice as hard as a 4. (For example, diamond is 4X harder than sapphire!).It is really a scale of relative "scratchability".
#1 is softest..................#10 is hardest
| #1 | Talc |
| #2 | Gypsum |
| #3 | Calcite |
| #4 | Fluorite |
| #5 | Apatite |
| #6 | Feldspar |
| #7 | Quartz |
| #8 | Topaz |
| #9 | Corundum |
| #10 | Diamond |
Gemstones and Mohs Scale
 Diamond: .............10 |  Syth. Moissanite:.......9.5 |  Corundum: ................9 |
| Cubic Zirconia:.. .8.5 |  Spinel: ........................8 |  Topaz: .......................8 |
 Emerald: .......7.5 - 8 |  Almandite: ...............7.5 |  Rhodolite: ..........7 - 7.5 |
| Pyrope: ........7 - 7.5 |  Spessartite: ...........7 - 7.5 |  Tourmaline: ........7 - 7.5 |
 Iolite: ...........7 - 7.5 |  Quartz Group: .............7 |  Peridot: ..............6.5 - 7 |
 Jadeite:.. ...6.5 - 7 |  Andradite: .............6.5 - 7 |  Scapolite: ..............6.5 |
 Zircon (low): .......6.5 |  Tanzanite: ............6.5 - 7 |  Feldspars: ............6 - 7 |
 Nephrite:.......6 - 6.5 |  Opal: ........................5.5 |  Lazulite: ...............5 - 6 |
| Lapiz Lazuli:.....5- 6 |  Turquoise: ..............5 - 6 |  Sphene: .............5 - 5.5 |
 Apatite: ...............5 |  Rhodochrosite: ............4 |  Coral .....................3 - 4 |
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