A fine sapphire single-stone ring. Photo courtesy Bonhams.

The octagonal sapphire, weighing 11.85 carats, between square-cut diamond shoulders, the gallery and shoulders decorated with single-cut diamonds, ring size K. Estimate £80,000 - 120,000 (97,000 - 150,000)

Accompanied by a copy of a report from Gübelin stating that the sapphire is of Burmese origin, with no indications of thermal treatment. Report number 9504017, dated 6 April 1995.

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