Wiktionary
alt. 1 An uncut diamond. 2 (context idiomatic English) A person whose goodness or other positive qualities are hidden by a harsh or unremarkable surface appearance. n. 1 An uncut diamond. 2 (context idiomatic English) A person whose goodness or other positive qualities are hidden by a harsh or unremarkable surface appearance.
Wikipedia
Diamond in the Rough is the fourth studio album released by American country music artist Jessi Colter. It was the second album issued by Colter in 1976; the previous was Jessi, released earlier in the year. Diamond in the Rough was issued under Capitol Records and was produced by Ken Mansfield.
"Diamond in the Rough" is the 10th episode of the fourth season of the American sitcom Modern Family, and the series' 82nd episode overall. It aired December 12, 2012. The episode was written by Dan O'Shannon, Becky Mann & Audra Sielaff and directed by Gail Mancuso.
Usage examples of "diamond in the rough".
She had even put the Tiger God and Green Suite on display, complete with the silver-green diamond in the rough.
He went on for a while, spinning yet another identity for himself -- a sort of diamond in the rough Commodore Vanderbilt type, straight-talking and mean as a snake.
It hardly established me as a diamond in the rough, but I told myself I’.
She watched him pore over the sidewalk art, searching always for another diamond in the rough.