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TOKYO, JAPAN - MAY 12: Diana, Princess Of Wales With Prince Charles Before Dinner With Emperor Hirohito In Japan. She Is Wearing A Pleated Royal Blue Evening Dress Designed By Fashion Designer Yuki And A Sapphire And Diamond Headband Made From Jewels Which She Had Reset From The Saudi Suite Converting The Watch Into A Choker To Wear On Her Forehead. (Photo by Tim Graham Photo Library via Getty Images)

TOKYO, JAPAN - MAY 12:  Diana, Princess Of Wales With Prince Charles Before Dinner With Emperor Hirohito In Japan. She Is Wearing A Pleated Royal Blue Evening Dress Designed By Fashion Designer Yuki And A Sapphire And Diamond Headband Made From Jewels Which She Had Reset From The Saudi Suite Converting The Watch Into A Choker To Wear On Her Forehead.  (Photo by Tim Graham Photo Library via Getty Images)