a diamond in the rough

someone or something whose good qualities are hidden This film is one of those diamonds in the rough, a wonderful gem that almost no one has noticed.

Etymology: based on the idea that you cannot see the beauty of a diamond (jewel) when it is rough (not yet cut and filled with brightness)

Name	Pronounced	Usage
Fabiana	fah-BYAH-nah (Italian)	Italian, Spanish, Portuguese, Ancient Roman
Mollie	MAHL-ee	English
Olympia	-	Greek, Slovak
Alessia	-	Italian
Cochran	['kɔkən]
Candelaria	kahn-de-LAH-ryah	Spanish