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.