A 23.30 carats fancy dark yellow-brown diamond and diamond ring. Estimate $250,000 – $300,000. Photo Christie's Image Ltd 2015

Set with a cut-cornered rectangular step-cut fancy dark yellow-brown diamond, weighing approximately 23.30 carats, flanked on either side by a trapezoid-cut diamond, ring size 6, mounted in platinum

Accompanied by report no. 5141982373 dated 1 October 2012 from the GIA Gemological Institute of America stating that the diamond is fancy dark yellow-brown, natural color, VS1 clarity

Christie's. IMPORTANT JEWELS, 20 October 2015, New York, Rockefeller Plaza