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A single-row natural pearl necklace. Estimate £10,000 - 15,000 (€14,000 - 21,000). Photo: Bonhams.

The graduated row of 75 vari-coloured pearls, measuring from 4.23 to 7.13mm, to a pavé-set single-cut diamond clasp, diamonds approximately 0.15 carat total, length 47.5cm 

Accompanied by a report from AnchorCert stating that an extensive sample of the pearls was found to be natural, saltwater. Report number 20018442, dated 19 August 2014.

Bonhams. FINE JEWELLERY, 24 Sep 2015 12:00 BST - LONDON, NEW BOND STREET