rough diamond

rough diamond

a person who has genuinely fine qualities but uncouth manners – informal

Literally, a rough diamond is a diamond before it has been cut and polished. A North American variant of this expression is a diamond in the rough.


diamond cut diamond

a situation in which a sharp-witted or cunning person meets their match – British

1863 - Charles Reade - Hard Cash - He felt sure his employer would outwit him if he could and resolved it should be diamond cut diamond.

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