A Sapphire and Diamond Ring, by Van Cleef & Arpels. Photo: Christie's Images Ltd 2012

Set with a sugarloaf cabochon sapphire, weighing approximately 31.53 carats, within a circular-cut diamond surround, to the circular-cut diamond shoulders, mounted in gold and platinum. Signed Van Cleef & Arpels, N.Y., no. 17988. Estimate $300,000 - $500,000

With report CS 48240 dated 5 March 2012 from the American Gemological Laboratories stating that it is the opinion of the Laboratory that the origin of this sapphire would be classified as Kashmir. Heat Enhancement: None

Christie's. Magnificent Jewels, 17 April 2012, New York, Rockefeller Plaza