A single-row pearl necklace. Estimate £10,000 - 12,000 (€14,000 - 16,000). Photo: Bonhams.

The graduated row of 68 pearls, measuring from 3.9 to 8.4mm, with a single and old-cut diamond clasp, length 45.0cm

Accompanied by a report from GCS stating that of the 68 pearls, 65 are natural, saltwater, and 3 are cultured. Report number 5775-1631, dated 19 March 2015.

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