Diana, Princess of Wales, wears her engagement ring and wedding band as she arrives for a lunch function at the London headquarters of the English National Ballet in London in an August 28, 1996 file photo.[Photo/Agencies]

Prince William is seen making a royal salute as he watches the scene of Trooping the Colour from the balcony of Buckingham Palace with his brother Harry and mother Princess Diana in London in this June 15, 1985 file photograph.[Photo/Agencies]