noun
a naturally occurring mineral that is uncut and unpolished, typically used in jewelry
adjective
having a surface that is uneven or not smooth
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The jeweler examined the rough diamond for any imperfections before beginning the cutting process.
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My friend may seem a bit rough around the edges, but he's a real rough diamond once you get to know him.
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That guy may look like a rough diamond, but he's actually pretty cool once you give him a chance.
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Despite her tough exterior, she was like a rough diamond - with some polishing, she showed her true beauty.