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HUNGARY - MAY 07: Princess Diana wearing a white strapless dress, embroidered with pearls, designed by Catherine Walker for a banquet during her official visit to Hungary, A pearl and sapphire choker completes the look (Photo by Tim Graham Photo Library via Getty Images)

HUNGARY - MAY 07:  Princess Diana wearing a white strapless dress, embroidered with pearls, designed by Catherine Walker for a banquet during her official visit to Hungary, A pearl and sapphire choker completes the look  (Photo by Tim Graham Photo Library via Getty Images)