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
Emilie	e-MEE-lee-ə (German), e-MEE-lee-e (Norwegian), EM-i-lee (Swedish)	German, Danish, Norwegian, Swedish
Evaline	-	English
Esmaralda	ez-mə-RAHL-də	English (Rare)
Linnie	LIN-ee	English
Laney	LAYN-ee	English
Tufayl	-	Arabic