One of the world's rarest diamonds is up for auction - for an expected £15million. The Mediterranean Blue is a vivid blue diamond ring weighing more than ten carats. And the stone is classified ...

Sotheby’s said Thursday it will offer a group of eight Fancy blue diamonds that will be sold across its Magnificent Jewels auctions in New York, Geneva and Hong Kong beginning in November ...

Starting this fall, Sotheby’s will auction off eight blue diamonds from luxury jeweler De Beers. The group, called the De Beers Exceptional Blue Collection, was sourced from South Africa’s ...