A 10.39 carats diamond single-stone ring. Estimate £70,000 - 90,000 (€96,000 - 120,000). Photo: Bonhams.

The brilliant-cut diamond, weighing 10.39 carats, within an eight-claw setting, ring size J½

Accompanied by a report from GIA stating that the diamond is K colour, VS2 clarity. Report number 6173078165, dated 17 March 2015.

BONHAM'S. FINE JEWELLERY, 22 Apr 2015 14:00 BST -LONDON, NEW BOND STREET