A diamond single-stone ring. Photo Bonhams.

The old brilliant-cut diamond, weighing 10.14 carats, within a six double-claw setting, to a pierced gallery and engraved shoulders, ring size M½. Estimate £50,000 - 70,000 (€60,000 - 85,000)

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