A 26.11 carats heart-shaped diamond necklace. Estimate 400,000 – $500,000. Photo Christie's Image Ltd 2015

Set with a heart-shaped diamond, weighing approximately 26.11 carats, from a circular-cut diamond pendant hoop, to the fine link neckchain, mounted in platinum, 16 ins.

With report 1162599767 dated 9 September 2014 from the Gemological Institute of America stating that the diamond is I color, SI2 clarity

Christie's. MAGNIFICENT JEWELS, 14 April 2015, New York, Rockefeller Plaza