A diamond double-clip brooch-necklace, circa 1955. Photo: Bonhams.

The two pierced scrolling plaques, centrally-set with three cushion-shaped diamonds, the largest weighing 3.75 carats, within a baguette, brilliant and single-cut diamond undulating surround, to a detachable snake-link chain, remaining principal diamonds approx. 1.45cts and 1.25cts, remaining diamonds approx. 13.40cts total, two diamonds deficient, lengths: clips 7.4cm and 6.8cm, chain 40.5cm (3) (partially illustrated). Estimate £10,000 - 15,000 (€12,000 - 18,000)

Bonhams. JEWELLERY. London, Knightsbridge, 9 Apr 2014 - www.bonhams.com