An art deco natural pearl and diamond pendant-necklace, circa 1920. Estimate £8,000 - 12,000 (€11,000 - 16,000). Photo: Bonhams.

The natural drop-shaped pearl, measuring 11.1 x 17.0mm, with single and rose-cut diamond surmount of geometric design, on a fine ropetwist chain, mounted in platinum, pendant length 2.8cm, necklace length 45.0cm

Accompanied by a report from The Gem & Pearl Laboratory stating that the pearl is natural, saltwater. Report number 10983, dated 18 March 2015.

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