Gem Hardness scale
MOH'S SCALE OF HARDNESS
|
10
|
Diamond
|
|
9
|
Corundum
|
|
8
|
Topaz
|
|
7
|
Quartz
|
|
6
|
Feldspar
|
|
5
|
Apatite
|
|
4
|
Fluorite
|
|
3
|
Calcite
|
|
2
|
Gypsum
|
|
1
|
Talc
|
