Also Dumbledore said Malfoy would not be able to kill him, and he would rather have Snape kill him straight off, rather then Bellatrix or Fenrir to parade his body and mock him when killing him.
Riddle's Diary-second book
Gaunt's Ring-sixth book
Slytherin's Locket-fifth book
Hufflepuff's Cup-seventh book (first physical appearance, mentioned earlier)
Ravenclaw's Diadem-seventh book
Harry Potter-first book
Nagini-fourth book