An early 20th century emerald and diamond brooch-pendant. Photo: Bonhams.

Circular, set to the centre with a step-cut emerald, within borders of old brilliant-cut diamonds, mounted in gold, rhodium plated, emerald approximately 1.60 carats, diamonds approximately 12.40 carats total, detachable brooch fitting, diameter 3.2cm. Estimate £6,000 - 8,000 (€7,300 - 9,700)

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