Sales slump takes the shine off De Beers as latest diamond auction makes just £250m
De Beers - where Black Panther star Lupita Nyong'o (pictured) is a global ambassador - has struggled with a slump in sales and prices.
De Beers - where Black Panther star Lupita Nyong'o (pictured) is a global ambassador - has struggled with a slump in sales and prices.