Stone
Diamond
Diamond is crystalline carbon and ranks 10 on the Mohs scale, giving it exceptional resistance to scratching. Hardness is not the same as toughness, however, so a diamond can still chip or fracture from a hard impact.
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Diamond is crystalline carbon: a single element arranged in a tightly bonded crystal structure. It ranks 10 on the Mohs scale, giving it exceptional resistance to scratching. Hardness is not the same as toughness, however; like any gemstone, diamond can chip or cleave if struck sharply in a vulnerable direction.