A Belle Époque natural pearl, emerald and diamond lavallière, circa 1905. Estimate £20,000 - 30,000 (€27,000 - 41,000). Photo: Bonhams.

Suspending two cartouche-shaped single-cut diamond pendants of unequal length, one with a natural pearl and diamond foliate centre and natural pearl drop, the other with a cabochon emerald and diamond foliate centre and cabochon emerald drop, suspended from a natural pearl, old brilliant, single and rose-cut diamond knot motif via articulated knifewire chains decorated at intervals with cabochon emeralds and old brilliant-cut diamonds, mounted in platinum and gold, length of pendant and longest point 12.9cm, fitted case by Poupon Freres Joailliers Monte-Carlo 

Accompanied by a report from GCS stating that the three pearls are natural, saltwater. Report number 5775-1085, dated 27 November 2014.

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