A rare coloured diamond and diamond ring, by Harry Winston. Photo Christie's Image Ltd 2014

Set with a rectangular-shaped orangy pink diamond weighing 12.93 carats, to the marquise-cut diamond shoulders, mounted in platinum, ring size 4½. Signed and with maker's mark for Harry Winston. Estimate HK$12,500,000 - HK$20,000,000 ($1,619,285 - $2,590,856). Price Realized HK$28,120,000 ($3,642,744)

Accompanied by report no. 5151834877 dated 20 December 2013 from the Gemological Institute of America stating that the 12.93 carat diamond is fancy orangy pink, natural colour, VS2 clarity, with excellent polish

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