A sapphire and diamond ring, by Harry Winston. Photo Christie's Image Ltd 2013

Set with a cushion-shaped sapphire weighing approximately 14.49 carats, flanked by oval-shaped diamonds weighing approximately 1.15 and 1.04 carats, mounted in platinum, ring size 5½. Signed HW for Harry Winston. Price Realized $547,514

Accompanied by report no. CS 38632 dated 11 October 2006 from the American Gemological Laboratories stating that based on available gemological information, it is the opinion of the Laboratory that the sapphire weighing 14.49 carat is natural, the origin of this material would be classified as Ceylon (Sri Lanka), no gemological evidence of heat enhancement present, clarity enhancement: none 

Two reports nos. 10135212 and 14335881 dated 14 May 1997 and 27 April 2005 from the Gemological Institute of America stating that the 1.15 and 1.04 carat diamonds are D colour, internally flawless clarity 

Please note that three certificates are more than 5 years old and might require an update 

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