A Diamond Necklace, by Cartier. Photo Christie's Image Ltd 2012

The neckline set with brilliant and square-cut diamonds, suspending swags of graduated baguette-cut diamonds enhanced by swags of pear and marquised-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 CHF400,000 - CHF600,000

Christie's. Geneva Magnificent Jewels, 13 November 2012, Geneva