GENEVA (AP) — A rare Burmese ruby in a platinum ring with diamonds sold for $30.3 million at auction, setting a world auction record for any ruby and for any stone by Cartier, according to Sotheby’s.

Before the holiday season, Los Angeles-based jeweler Suzanne Kalan made trips to the U.K. and Bahrain to showcase the samples in her Burmese ruby collection that will hit upscale retail and online ...

The top lot is the Red Dragon, a 6.43-carat Burmese ruby and diamond ring estimated at $1 million to $1.5 million. The exceptional purplish-red color is natural (many rubies are heat-treated). It is ...

Featuring one square cushion mixed cut ruby weighing approximately 1.00 carat by formula, flanked by transitional and baguette cut diamonds weighing approximately 1.00 carat total. Mounted in ...