1a : native crystalline carbon that is the hardest known mineral, that is usually nearly colorless, that when transparent and free from flaws is highly valued as a precious stone, and that is used industrially especially as an abrasive also : a piece of this substance. b : crystallized carbon produced artificially.
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1a : native crystalline carbon that is the hardest known mineral, that is usually nearly colorless, that when transparent and free from flaws is highly valued as a precious stone, and that is used industrially especially as an abrasive also : a piece of this substance. b : crystallized carbon produced artificially.
Answer:
1.
a precious stone consisting of a clear and colourless crystalline form of pure carbon, the hardest naturally occurring substance.
"a diamond ring"