A pair of natural pearl and diamond earrings. Photo: Bonhams.

The bouton-shaped pearls measuring approximately 11.9 x 12.0mm and 12.3 x 12.4mm, each with an old brilliant-cut diamond surmount, diamonds approximately 0.50 carat total, length 1.5cm. Estimate £15,000 - 20,000 (€18,000 - 24,000)

Accompanied by a report from The Gem & Pearl Laboratory stating that the pearls are natural, saltwater. Report number 09430, dated 11 February 2014.

Bonhams. FINE JEWELLERY. London, New Bond Street, 30 Apr 2014 - www.bonhams.com