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

Set with a square-shaped fancy yellow diamond weighing 25.34 carats, to the brilliant-cut diamond gallery and half-hoop, mounted in 18k white gold, ring size 5¾. Price Realized $361,126

Accompanied by report no. 2155253158 dated 14 February 2013 from the Gemological Institute of America stating that the 25.34 carat diamond is fancy yellow, natural colour, SI2 clarity

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