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NEW ZEALAND - APRIL 29: Diana, Princess of Wales at a banquet in New Zealand wearing the Cambridge knot tiara (Queen Mary's tiara ), Her cream silk organza evening dress is designed by fashion designer Gina Fratini (Photo by Tim Graham Photo Library via Getty Images)

NEW ZEALAND - APRIL 29:  Diana, Princess of Wales at a banquet in New Zealand wearing the Cambridge knot tiara (Queen Mary's tiara ), Her cream silk organza evening dress is designed by fashion designer Gina Fratini  (Photo by Tim Graham Photo Library via Getty Images)