A 30.78 carats modified square-cut fancy brown-yellow diamond and diamond ring. Estimate 400,000 – $500,000. Photo Christie's Image Ltd 2015

Set with a modified square-cut fancy brown-yellow diamond, weighing approximately 30.78 carats, to the circular-cut diamond, brown diamond and yellow diamond shoulders, mounted in 18k gold

With report 2155762105 dated 18 November 2013 from the Gemological Institute of America stating that the diamond is fancy brown-yellow, natural color, VS1 clarity

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