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Glossary of watchmaking

Hardness

Dureté | 硬度/コウド | 硬度

Hardness

The resistance of a material to scratching and wear. Hardness is measured using the Moh's Scale. This scale indicates that One substance can scratch the substance below it and scratch itself. For example, a diamond (10) will scratch ruby (9) and its self, but not the other way around, so a diamond is harder.