A diamond bow brooch. Photo: Bonhams.

Modelled as a tied ribbon suspending an oval openwork plaque and further drop, set throughout with old brilliant, cushion and pear-shaped diamonds, diamonds approx. 6.90cts total, length 7.0cm. Estimate £3,500 - 4,500 (€4,200 - 5,400)

Bonhams. JEWELLERY. 12 Feb 2014, London, Knightsbridge - www.bonhams.com