A striking colored-diamond ring is the star of Christie’s upcoming ... and a Mystery Set bow necklace could achieve up to $800,000. Antique ruby and diamond necklace-tiara Christie’s Another ...

A 10.33-carat Burmese ruby sold for an impressive $5.5 million after a six-minute bidding war among two bidders on the phone and one in the New York saleroom at Sotheby’s Magnificent Jewels auction.