The second-biggest diamond in history will be cut, polished and turned into a collection of Louis Vuitton jewellery.

Lucara Diamond Corporation, which found the 1,758-carat Sewelo diamond at its Botswana mine last year, said it has struck a deal with the luxury brand and Antwerp diamond manufacturer HB Company. It is unclear how valuable the polished diamonds will be though, as Lucara previously said the Sewelo was not a type of diamond that yields top jewellery-standard gems...