Unearthed in Botswana last year, the 2,492–carat stone is known as Motswedi. Before it finds its home, gem dealer HB Antwerp needs to price it – something that is proving tricky. 'At the moment it's ...

The dazzling Motswedi diamond, the world’s second-largest gem, could soon dazzle visitors in a sheikh’s private museum once its true worth is assessed. Discovered in Botswana last year, the colossal 2 ...