A sapphire and diamond ring, by Van Cleef & Arpels. Photo: Christie's Images Ltd 2013

Set with a rectangular-cut sapphire, weighing approximately 13.18 carats, flanked on either side by a trillion-cut diamond, mounted in platinum, 1955. Signed Van Cleef & Arpels, N.Y., no. 23550. Estimate:  $350,000 – $500,000

With report CS 56806 dated 30 August 2013 from the American Gemological Laboratories stating that it is the opinion of the Laboratory that the origin of the sapphire would be classified as Burma (Myanmar). No gemological evidence of heat

Christie's. MAGNIFICENT JEWELS. 15 October 2013. New York, Rockefeller Plaza.