Later , Ravenclaw 's diadem is found to be one of Voldemort 's Horcruxes .
Later , Ravenclaw 's diadem is has been hidden in the Room of Hidden Things by Voldemort .
Later , Ravenclaw 's diadem is found to be one of Voldemort 's Horcruxes and has been hidden in the Room of Hidden Things by Voldemort .