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Skimming through the pages of Famous Jewellery Collectors, by Stefano Papi and Alexandra Rhodes, he was amazed to see a photograph of the Hollywood star Joan Crawford wearing a gold, aquamarine and diamond parure that he was selling on his stand. She is thought to have worn the gems often, both offscreen and on.

The necklace, bracelet and brooch suite was originally bought in New York at Sotheby’s sale of Andy Warhol’s Collection of Jewellery and Watches in 1988, said Mr Edwards, who has the provenance for it since it was made by George Verger in France.