An Art Deco natural pearl, sapphire and diamond necklace, circa 1930. Estimate £40,000 - 60,000 (€55,000 - 82,000). Photo: Bonhams.

The three graduated rows of natural pearls, measuring from 3.3 to 8.4mm, with a clasp set with a step-cut sapphire within a surround of old brilliant-cut diamonds, mounted in platinum, sapphire approximately 6.70 carats, diamonds approximately 1.80 carats total, length shortest row 56.0cm

Accompanied by a report from GCS stating that the pearls are natural, saltwater. Report number 5775-2188, dated 12 June 2015.

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