A diamond ring, by Graff

Of bombé design, the brilliant-cut diamond weighing 4.99 carats within a step-cut diamond pavé-set mount. Signed Graff (worn). Estimate £40,000 - £50,000 ($63,320 - $79,150)

Accompanied by report No. 1102602765 dated 5 March 2009 from the Gemological Institute of America (GIA) stating that the diamond is F colour, VS2 clarity

Christie's. Jewellery. 10 June 2009. London, King Street www.christies.com