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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