A striking colored-diamond ring is the star of Christie’s upcoming jewelry sale. The 5.7-carat fancy intense blue diamond ring leads the auction house’s Magnificent Jewels auction with an ...

A very rare blue diamond sold for over $40m (£32m) at a Christie's auction in Geneva, news agencies said. The 17.61 carat, pear-shaped Bleu Royal diamond, set in a ring, fetched $43.8 million ...