Diamond

Diamonds in the finest qualities command the highest prices per carat of all gems.
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Diamond is a 10 out of 10 on the Mohs scale of hardness. Their resistance to scratching, in addition to their beauty, is another reason why they’re so popular in jewelry.​

The 4 Cs (Color, Clarity, Cut, and Carat Weight) are the main factors when assessing diamond quality and determining value.