rough diamond

noun

1. an unpolished diamond

2. an intrinsically trustworthy or good person with uncouth manners or dress

Example Sentences

India exports about $10 billion a year of gems and jewelry to the U.S., according to the Global Trade Research Initiative, and processes most of the world’s rough diamonds.

Read more on The Wall Street Journal

Everyone knew Jackson was a rough diamond, having played just 1,758 minutes of top-flight football, but he quickly established himself as Chelsea's starting striker.

Read more on BBC

The Parkhead club once had a bit of a Midas Touch when it came to finding rough diamonds, polishing them up and then selling them on.

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In a statement, Lucara said the stone was "one of the largest rough diamonds ever unearthed".

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The company owns 85% of De Beers, which produces about a third of the world’s rough diamonds and sells diamond jewelry.

Read more on Seattle Times