A diamond necklace, by Cartier. Photo Christie's Image Ltd 2013

The neckline set with brilliant and square-cut diamonds, suspending swags of graduated baguette-cut diamonds enhanced by swags of pear and marquise-shaped diamonds at the front, 38.0 cm, with French assay marks for platinum and gold, in red leather Cartier case Signed Cartier Paris, no. P7279. Estimate CHF270,000 – CHF350,000

Christie's. MAGNIFICENT JEWELS. 15 May 2013. Geneva