A diamond and emerald necklace. Photo Christie's Image Ltd 2014

Designed as an openwork tapered band, centering upon a modified cushion-cut fancy grayish greenish yellow diamond, weighing approximately 10.96 carats and two rectanguar-cut emeralds, weighing approximately 11.33 and 10.60 carats, joined by marquise and circular-cut diamond flower blossoms, within circular-cut diamond borders, mounted in white and yellow gold, 15 ins. Estimate $60,000 – $80,000

With report 5141090554 dated 15 November 2011 from the Gemological Institute of America stating that the diamond is fancy grayish greenish yellow, natural color

With report CS 60303 dated 15 April 2014 from the American Gemological Laboratories stating it is the opinion of the Laboratory that the origin of the emerald, weighing approximately 11.33 carats, would be classified as Colombia. Minor clarity enhancement, modern type

With report CS 60304 dated 15 April 2014 from the American Gemological Laboratories stating it is the opinion of the Laboratory that the origin of the emerald, weighing approximately 10.60 carats, would be classified as Colombia. Minor to moderate clarity enhancement, modern type

Christie's. IMPORTANT JEWELS, 10 June 2014, New York, Rockefeller Plaza - http://www.christies.com/