Two factors determine how a piece of jewelry will perform at auction: Its intrinsic value coupled with its provenance (the paper trail documenting who made or owned it). In the case of the 17.21-carat ...

Harry Winston was often referred to as the King of Diamonds thanks to his knack for acquiring some of the rarest stones ever discovered, from the 726-carat Jonker to Evalyn Walsh McLean’s 94.8-carat ...

“You wait a life-time to have a chance at having an extremely rare Kashmir sapphire in an auction house, and we have had four in the space of eight months,” the astonished and very thankful director ...