diamond in the rough

Cultural  

1. Someone or something with potential or talent but lacking training or polish: “Her singing voice is beautiful, but she needs help with her gestures; she's a diamond in the rough.” This phrase refers to the fact that diamonds found in nature are rough and uneven. They must be cut and polished to bring out their true beauty.

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diamond in the rough Idioms  

1. Also, a rough diamond. A person of exceptional character or potential but lacking polish and refinement. For example, Jack is intelligent and trustworthy but lacks manners—he's a diamond in the rough. [Early 1600s]

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Example Sentences

Investors always like to find a diamond in the rough.

From Barron's

“Everyone would want the diamond in the rough, which is really the studios business ... and HBO.”

From Los Angeles Times

Like most late-round prospects hoping to become a diamond in the rough, Horn came with questions.

From Los Angeles Times

“But the diamond in the rough is that the Duke’s family and the surfing community have all rallied around. I am so appreciative.”

From Los Angeles Times

Wild Mother had also turned to social media to find her tribe - having been called "a weirdo, an alien, a diamond in the rough" offline - and has built a following of thousands.

From BBC