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WASHINGTON, UNITED STATES - NOVEMBER 01: Princess Of Wales Wearing The Cambridge Knot Queen Mary Tiara Of Diamonds And Pearls Given To Her By The Queen At The British Embassy In Washington (Photo by Tim Graham Photo Library via Getty Images)

WASHINGTON, UNITED STATES - NOVEMBER 01:  Princess  Of Wales Wearing The Cambridge Knot Queen Mary Tiara Of Diamonds And Pearls Given To Her By The Queen At The British Embassy In Washington  (Photo by Tim Graham Photo Library via Getty Images)