A single-row natural pearl necklace. Photo: Bonhams.

The graduated row of eighty-nine natural pearls, measuring from 3.44 to 8.07mm, with a ruby and diamond clasp, length approximately 55.0cm. Estimate £4,000 - 6,000 (€4,900 - 7,300)

Accompanied by a report from AnchorCert stating that an extensive sample of pearls was tested and found to be natural, saltwater. Report number 20015206, dated 19 March 2014.

Accompanied by a report from CISGEM stating that the pearls are natural, saltwater. Report number 54836, dated 21 January 2010.

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