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

Designed as a graduated line of ten cushion-cut sapphires, weighing from approximately 11.56 to 19.57 carats, spaced by marquise-cut diamonds, mounted in platinum, 6¾ ins. Estimate $400,000 – $600,000

With report CS 58906 dated 19 February 2014 from the American Gemological Laboratories stating that it is the opinion of the Laboratory that the origin of the sapphires would be classifed as Ceylon (Sri Lanka). Enhancement: Heat

With ten reports dated from 11 December 2013 to 23 March 2001 stating that the ten marquise-cut diamonds, weighing from approximately 1.53 to 1.00 carat, range from E to G color and from VS1 to SI1 clarity

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