Jadeite is 6.5 to 7, and nephrite is 6 to 6.5 on the Mohs hardness scale. Hardness and toughness Gem and mineral hardness is measured on the Mohs scale. The numbers are based on the relative ease or ...
Pearl’s Mohs hardness is 2.5, so care should be taken not to scratch it. Gem and mineral hardness is measured on the Mohs scale. The numbers are based on the relative ease or difficulty with which one ...
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