According to the Daily Mail, the diamond was cut from a 236-carat rough diamond found in Botswana.
They remain like a rough diamond, needing only the work of the lapidary—America—to show to the world their full beauty and value.
And so you discovered your rough diamond yesterday, and have polished him in a day.
He was a rough diamond, but every inch a soldier and a good loyal subject.
He was a rough diamond—a rough sort of man in every sense of the word.
Miss Addison became an ideal friend because she undertook to improve the rough diamond, if it were indeed a diamond at all.
A rough diamond, needing nothing but to be cut, polished, and set!
rough diamond, I know, 'nall that short o' shing, but lack polish an' easy grace.
They saw no city airs; all they saw was that a rough diamond had been polished.
Suppose James was a rough diamond; he might still make a better husband than some other man better educated.