A fine ruby and diamond ring. Photo: Christie's Images Ltd 2012

The bezel-set modified cushion-cut ruby, weighing approximately 6.18 carats, within a baguette-cut diamond surround, mounted in 18k gold. Estimate $150,000 - $250,000. Price Realized $1,650,500

With report CS 52006 dated 15 October 2012 from the American Gemological Laboratories stating that it is the opinion of the Laboratory that the origin of the ruby would be classified as Burma (Myanmar). No gemological evidence of heat

With report 12105052 dated 29 October 2012 from the Gübelin Gem Lab stating that gemmological testing revealed characteristics consistent with those of rubies originating from Burma (Myanmar). No indications of heating; accompanied by a supplemental appendix attesting to the rarity of the ruby

Christie's. Magnificent Jewels . 10 December 2012 New York, Rockefeller Plaza