A ruby and diamond cluster ring. Photo: Bonhams.

The oval-cut ruby, weighing 6.17 carats, within a brilliant-cut diamond surround, diamonds approximately 2.40 carats total, ring size N. Estimate £12,000 - 15,000 (€14,000 - 18,000)

Accompanied by a report from The Gem & Pearl Laboratory stating that the ruby is of Burmese origin, with no evidence of heat treatment. Report number 05398, dated 23 March 2012.

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