How Cartier's New York store was swapped for Maisie Plant's pearl necklace

Fun to share the story of how Pierre Cartier secured the New York flagship at 653 5th Ave in exchange for Maisie Plant's double-stranded pearl necklace.... in what must have been amongst the greatest business trades of the twentieth century!
With thanks to Bahrain Institute for Pearls & Gemstones (DANAT)