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SWITZERLAND - APRIL 29: The Queen In Tiara And Diamonds For State Banquet At British Ambassadors Residence In Berne Switzerland. Tour Dates 29 April - 2 May 1980 (exact Day Date Not Certain) (Photo by Tim Graham/Getty Images)

SWITZERLAND - APRIL 29:  The Queen In Tiara And Diamonds For State Banquet At British Ambassadors Residence In Berne Switzerland. Tour Dates 29 April - 2 May 1980 (exact Day Date Not Certain)  (Photo by Tim Graham/Getty Images)