Rio Tinto " Rio Tinto announced it has unearthed one of Canada’s largest-ever, gem-quality rough diamonds at its Diavik diamond mine in the remote Northwest Territories, a 187.7-carat stone called the Diavik Foxfire.
The gem, now being showcased at Kensington Palace in London, will later be assessed at Rio Tinto’s diamond sales and marketing hub in Antwerp. Rio Tinto, which expects the stone to produce at least a 50-carat polished diamond, did not estimate the gem’s value. "
https://www.theglobeandmail.com/report-on-business/industry-news/energy-and-resources/rio-tinto-finds-one-of-canadas-largest-diamonds-at-arctic-mine/article27563717/