VIENNA - APRIL 16: Diana, Princess of Wales, wearing a sapphire diamond and pearl necklace, attends a banquet on April 16, 1986 in Vienna, Austria (Photo by Anwar Hussein/Getty Images)
VIENNA - APRIL 16: Diana, Princess of Wales, wearing a sapphire diamond and pearl necklace, attends a banquet on April 16, 1986 in Vienna, Austria (Photo by Anwar Hussein/Getty Images)