Ravenclaw's lost diadem was the last Horcrux Voldemort intentionally created before the killing curse rebounded, and was destroyed accidentally with fiendfyre that was produced by Vincent Crabbe ...

Ravenclaw's Diadem is the only Horcrux whose killer differs between the books and movies, although the method stays the same. In the books, it is Vincent Crabbe who produced the fiendfyre intended ...