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Princess Josephine Charlotte of Belgium, consort of Jean, Grand Duke of Luxembourg pictured wearing a jewelled tiara and necklace at a formal evening function in 1967. (Photo by Rolls Press/Popperfoto/Getty Images)

Princess Josephine Charlotte of Belgium, consort of Jean, Grand Duke of Luxembourg pictured wearing a jewelled tiara and necklace at a formal evening function in 1967. (Photo by Rolls Press/Popperfoto/Getty Images)