A coloured diamond, diamond, coral and cultured pearl ring, by Taffin. Photo Christie's Image Ltd 2014

Set with a cushion-shaped fancy violet-grey diamond weighing approximately 5.64 carats, within a cluster of light pink coral bead surround, accented by four round white cultured pearls, to the pavé-set single-cut diamond hoop, mounted in platinum and 18k rose gold, ring size 5, in brown suede Taffin case. Signed and with maker's mark for Taffin, No. TF3783. Estimate HK$2,800,000 – HK$3,800,000 ($362,915 - $492,528)

Accompanied by duplicate report no. 5151274542 dated 7 March 2013 from the Gemological Institute of America stating that the 5.64 carat diamond is fancy violet-grey, natural colour, VVS1 clarity

Christie's. HONG KONG MAGNIFICENT JEWELS, 27 May 2014, Convention Hall - http://www.christies.com/