A sapphire and diamond cluster ring. Photo: Bonhams.

The cut-cornered step-cut sapphire, weighing 3.91 carats, within a brilliant-cut diamond border, diamonds approximately 1.20 carats total, ring size J. Estimate £9,000 - 10,000 €11,000 - 12,000)

Accompanied by a report from The Gem & Pearl Laboratory stating that the sapphire is of Sri Lankan origin, with no evidence of heat treatment. Report number 09592, dated 18 March 2014.

Bonhams. FINE JEWELLERY, 30 Apr 2014, London, New Bond Street - www.bonhams.com