4 - Portrait-charge du peintre Jombert, les bras ballants, 1773-1774, Paris musée du Louvre, (c)RMN - Grand Palais (musée du Louvre)

A colored diamond and diamond ring. Photo Christie's Image Ltd 2014

Set with a pear-shaped fancy deep brownish greenish yellow diamond, weighing approximately 10.03 carats, to the circular-cut diamond flower blossom cluster surround and shoulders, mounted in platinum and 18k white gold. Estimate $300,000 – $500,000

With report 5151778262 dated 11 November 2013 from the Gemological Institute of America stating that the diamond is fancy deep brownish greenish yellow, natural color, SI2 clarity. The color of this diamond changes temporarily when gently heated, or when left in darkness for a period of time and is known in the trade as "CHAMELEON"

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