A star sapphire and diamond pendant. Photo Christie's Image Ltd 2014

Set with a double cabochon star sapphire, weighing approximately 68.36 carats, within a two-tiered circular-cut diamond surround, to the circular-cut diamond pendant hoop, mounted in platinum. Estimate $40,000 – $60,000

With report 2151824830 dated 12 December 2013 from the Gemological Institute of America stating that the geographic origin of this star sapphire is Sri Lanka. No indications of heating

Christie's. MAGNIFICENT JEWELS, 16 April 2014, New York, Rockefeller Plaza - www.christies.com