rough diamond

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.

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.

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.

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

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