Kate Middleton 's engagement ring is same one worn by Princess Diana . Old wives ' tale : Engagement rings may carry energy of previous owner . Superstition : If you wear a new wedding band, it will bring good luck to your future spouse and protect them from evil spirits. Although this family treasure is very dear to Prince William 's heart -- it was his mother 's engagement ring -- the superstitious may think that 28-year-old Kate should never have accepted it . Single women should not put ring on engagement finger as it might curse her to be single forever .
Kate Middleton 's engagement ring is same one worn by Princess Diana . Old wives ' tale : Engagement rings may carry energy of previous owner . Superstition : If you wear a new wedding band, it will bring good luck to your future spouse and protect them from evil spirits. Single women should not put ring on engagement finger as it might curse her to be single forever .