A pearl and diamond necklace. Estimate £20,000 - 30,000 '€27,000 - 41,000). Photo: Bonhams.

The graduated row of 38 vari-coloured pearls, measuring from 4.2 to 10.1mm, alternating with brilliant-cut diamonds,diamonds approximately 14.60 carats total, length 42.5cm

Accompanied by a report from GCS stating that of the 38 pearls, 33 are natural, saltwater, four are natural, freshwater, and one is cultured. Report number 5775-1899, dated 23 June 2015.

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