An impressive colored diamond and diamond brooch. Photo Christie's Image Ltd 2014

Of geometric motif, set at the center with a square-cut fancy intense yellow diamond, weighing approximately 30.73 carats, to the circular, baguette and triangular-cut diamond plaque, mounted in platinum. Estimate $500,000 – $700,000

With report 2155882190 dated 21 January 2014 from the Gemological Institute of America stating that the diamond is fancy intense yellow, natural color, VVS2 clarity

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