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Precioustone Diamond[1] is an enemy that appears in the Sonic the Hedgehog series. It appears around diamond-like fragments of the Precioustone and will attempt to protect them from foes.
Like the other Precioustone monsters, Precioustone Diamond's body is mostly an off-black color, with a diamond-like gemstone at its core and Void's triangular insignia on its head. Its head is shaped much like the spiked spiral end of a conch shell commonly seen inhabited by hermit crabs, with four segmented legs which it uses to attack its enemies.