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Tenacity (toughness) of Gems




Tenacity, or toughness, is the cohesiveness of a mineral. It is the resistance the mineral or gemstone offers to breakage. Tenacity and hardness, though not necessarily related, are factors that determine the durability of a gemstone.

Despite their incredible hardness (10), diamonds are relatively brittle because of their excellent cleavage. Nephrite Jade has a Mohs hardness of only 6-6.5, but is not easily broken.

Tenacity is given in degrees of toughness:

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