A single-stone diamond ring. Photo Christie's Image Ltd 2014

The central cushion shaped diamond weighing approximately 10.71 carats, flanked to either side by heart shaped diamond shoulders, raised on a plain hoop, finger size M. Estimate £100,000 – £150,000 ($167,400 - $251,100)

Christie's. IMPORTANT JEWELS, 4 June 2014, London, King Street -http://www.christies.com/