A natural pearl necklace. Photo Christie's Image Ltd 2012

The graduated row of sixty natural pearls measuring approximately 11.2-6.3mm, alternately strung with seed pearls, suspending a further natural pearl drop, measuring approximately 15.6x21.0mm, with rose-cut diamond cap, 74.0cm long. Price Realized £79,250

Accompanied by report no.06339 dated 25 September 2012 from The Gem and Pearl Laboratory, London, stating all the pearls are natural, saltwater, bar one seed pearl which is a bead-nucleated cultured pearl 

Christie's. Important Jewels. 12 December 2012. London, King Street