World Auction Record per Carat for a Ruby World Auction Record. Christie’s Hong Kong sale of Magnificent Jewels realised HK$747,894,000 / US$96,904,062, selling 80% by lot and 83% by value. The Crimson Flame, an exceptionally rare Burmese ruby, sold for HK$142 million / US$18 million, setting a world auction record per carat of US$1.2 million. […]