A modified square-cut fancy intense green diamond and diamond ring. Photo Christie's Image Ltd 2014

Set with a modified square-cut fancy intense green diamond, weighing approximately 3.60 carats, flanked on either side by a modified square-cut diamond, weighing approximately 0.74 and 0.72 carat, to the circular-cut diamond shoulders, mounted in platinum and 18k rose gold. Estimate $800,000 – $1,200,000

With report 1159646654 dated 5 September 2013 from the Gemological Institute of America stating that the diamond is fancy intense green, natural color, SI1 clarity

With report 113904328 dated 17 May 2012 from the Gemological Institute of America stating that the diamond, weighing approximately 0.74 carat, is D color, VVS2 clarity, with excellent polish and excellent symmetry

With report 1149557194 dated 24 January 2013 from the Gemological Institute of America stating that the diamond, weighing approximately 0.72 carat, is D color, VVS2 clarity, with excellent polish and excellent symmetry (3)

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