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Lot 60. An impressive 26.16 carats rectangular-cut diamond ring, by Oscar Heyman & Brothers. Estimate USD 550,000 - USD 750,000. Price Realised USD 727,500 © Christie's Images Ltd 2016.

Set with a rectangular-cut diamond, weighing approximately 26.16 carats, with graduated baguette-cut diamond shoulders, ring size 6 1/4, mounted in platinum. With maker's mark for Oscar Heyman & Brothers 

Accompanied by report no. 5172769656 dated 28 July 2016 from the GIA Gemological Institute of America stating that the diamond is J color, VS2 clarity

Christie's. Magnificent Jewels, 7 December 2016, New York, Rockefeller Plaza