A diamond cross brooch, circa 1830. Photo:Bonhams.

Each pear-shaped and old brilliant-cut diamond-set arm, to a central cushion-shaped and similarly-cut diamond cluster, highlighted by four spokes set with graduated old brilliant-cut diamonds, diamonds approx. 7.45cts total, composite, width 4.3cm. Estimate £4,000 - 6,000 (€4,900 - 7,300)

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