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History
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Meaning:
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a brilliant precious stone, the hardest substance known

gemstone

gem jewel rhinestone allotrope corundum ice lozenge paragon rhombus rock solitaire zircon bort brilliant jager
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Cases of word usage

1) a four-sided figure with equal sides, and angles which are not right angles (e.g. a diamond or lozenge shape) (rhombus)

DIAMOND as in Wiktionary
DIAMOND as in Wikipedia