Diamond Hardness

The diamond hardness was developed by Friedrich Mohs in 1822 and named as Mohs scale. Mohs chose ten different minerals and assigned numbers to them, based on that with which one could be scratched by another. List of 10 different mineral are:

·         Diamond                          10

·         Corundum                          9

·         Topaz                                  8

·         Quartz                                 7

·         Orthoclase Feldspar            6

·         Apatite                                5

·         Flourite                               4

·         Calcite                                3

·         Gypsum                             

 2

·         Talc                                    1

According to Mohs scale,Quartz can only be scratch by hardness of 7 or less. Corundum ( which include rubies and sapphires ) can be scratch by hardness of 9 or less. Similarly, Diamond can only be scratch by diamond .