The 10-point scale of mineral hardness. Diamonds score 10 on Mohs Scale. The diamond is the hardest of all known natural substances.
Moh’s Hardness Scale:
10 Diamond
9 Corundum
8 Topaz
7 Quartz
6 Orthoclase
5 Apatite
4 Fluorite
3 Calcite
2 Gypsum
1 Talc
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