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This past summer, the Victoria & Albert Museum plastered buses in London with ads for its sold-out Cartier exhibition in South Kensington, which is filled with some of the brand’s best pedigreed pieces: the Williamson Brooch owned by Queen Elizabeth II (loaned by King Charles III), Grace Kelly’s engagement ring (loaned by the Prince of Monaco), several jaw-dropping gems from the Al Thanis. But the majority of precious items came from the brand’s own extensive collection, which Cartier assembled over five decades, partly by buying back culturally significant pieces at auction.