A natural pearl and diamond ring, circa 1920. Photo: Bonhams.

The 11.54 x 11.60mm natural pearl between millegrain-set single-cut diamond shoulders, ring size G. Estimate £2,000 - 3,000 (€2,400 - 3,600)

Accompanied by a report from AnchorCert stating that the pearl is natural, saltwater. Report number 20015210, dated 19 March 2014.

Accompanied by a report from CISGEM stating that the pearl is natural, saltwater. Report number 82776, dated 17 January 2014.

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