A Single-Stone Coloured Diamond Ring, by Cartier. Photo Christie's Image Ltd 2013

The central square cut-cornered fancy intense yellow diamond weighing approximately 7.06 carats, raised on brilliant-cut diamond tapering shoulders, to a plain hoop, French marks for platinum. Signed Cartier and no.53 70473B. Price Realized : $159,137

Accompanied by report no.14681846 dated 26 October 2005 from The Gemological Institute of America (GIA), stating the 7.06 carat diamond is Natural Fancy Intense Yellow Colour and VS1 Clarity, with no fluorescence 

Christie's. JEWELLERY. 5 June 2013. London, King Street