A fancy-coloured diamond single-stone ring. Photo courtesy Bonhams.

The step-cut diamond, weighing 12.36 carats, in a four-claw setting, between baguette and tapering baguette-cut diamond shoulders, ring size K (sizing beads). Estimate £160,000 - 200,000 (€190,000 - 240,000)

Accompanied by a report from GIA stating that the diamond weighing 12.36 carats is fancy intense yellow, natural colour, VVS2 clarity. Report number 2155303562, dated 4 March 2013.

Bonhams. FINE JEWELLERY INCLUDING SELECTED JEWELS FROM THE COLLECTION OF BARBARA TAYLOR BRADFORD. London, New Bond Street. 5 Dec 2013 -www.bonhams.com