noun
A precious stone made of pure carbon that is valued for its brilliance and beauty
preposition
A small, unpolished, or uncut diamond that has the potential to become valuable once it is refined or polished
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The young artist was a diamond in the rough, with immense talent waiting to be polished and showcased.
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Yeah, he may seem a bit rough around the edges, but trust me, he's a diamond in the rough.
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She may not have the best grades, but she's a diamond in the rough when it comes to street smarts.
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The small town may not look like much now, but it's a diamond in the rough waiting to be discovered by tourists.