A coloured diamond ring. Photo Christie's Image Ltd 2013

Set with a pear-shaped fancy brown-yellow diamond weighing approximately 29.56 carats, mounted in 18k rose gold, ring size 6. Price Realized $656,241

Accompanied by report no. 1122414913 dated 23 July 2010 from the Gemological Institute of America stating that the 29.56 carat diamond is fancy brown-yellow, natural colour, VVS2 clarity. 

Christie's . HONG KONG MAGNIFICENT JEWELS.28 May 2013. Convention Hall - http://www.christies.com