A rare coloured diamond ring 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 ($1,620,156 - $2,592,250)

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