An oval-cut yellow colored diamond ring. Photo Christie's Image Ltd 2014

Set with an oval-cut fancy deep brownish greenish yellow diamond, weighing approximately 5.01 carats, within a circular-cut yellow diamond surround, to the circular-cut yellow diamond gallery and hoop, mounted in 18k gold, size 6. Estimate $50,000 – $70,000

With report 13374171 dated 11 May 2004 from the Gemological Institute of America stating that diamond is fancy deep brownish greenish yellow, natural color, SI1 clarity. 

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