A sapphire and diamond ring. Photo Christie's Image Ltd 2010

Set with a sugarloaf cabochon sapphire weighing 18.92 carats to the pavé-set diamond surround, trifurcated shoulders and half-hoop, ring size 6¾. Estimate $15,000 - $20,000. Price Realized $20,000

Accompanied by report no.GRS2008-033605 dated 31 March 2008 from the GRS Gem Research Swiss Lab stating that the sapphire is of Ceylon (Sri Lanka) origin, with no indications of heating

Christie's. JEWELS AND WATCHES: THE DUBAI SALE. 28 April 2010. Jumeirah Emirates Towers Hotel. www.christies.com