A diamond Maltese cross pendant-brooch, circa 1825. Photo: Bonhams.

Each arm set with cushion-shaped and old brilliant-cut diamonds, interspersed by a graduated row of similarly-cut diamonds, to a central old brilliant-cut diamond cluster, in open-back pinched collet-settings throughout, diamonds approx. 7.10cts total, detachable brooch setting, width 4.5cm. Estimate £3,000 - 4,000 (€3,600 - 4,800)

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