Uncovering the secrets of North America’s largest diamond

Africa is home to the world’s largest diamonds – but advances in mining technology are enabling other regions of the world to get in on the act.

Most recently, Canada unearthed the biggest diamond ever found in North America – the Foxfire.

It has spent the last couple of months on display at the Smithsonian’s National Museum of Natural History in Washington.

The BBC’s Jane O’Brien went to see it.

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