Ja tårarna skulle ha reparerat dagboken
Q: When Harry was stabbed by a basilisk in the Chamber of Secrets, since he was a Horcrux, shouldn't it have been destroyed then?
JKR: I have been asked that a lot. Harry was exceptionally fortunate in that he had Fawkes. So before he could be destroyed without repair, which is what is necessary to destroy a horcrux, he was mended. However, I made sure that Fawkes wasn't around the second time a Horcrux got stabbed by a basilisk fang, so the poison did its work and it was irreparable within a short period of time.... I established early in the book, Hermione says that you destroy a Horcrux by using something so powerful that there's no remedy. But she does say there is a remedy for basilisk poison but of course it has to be administered immediately and when they stab the cup later - boy I'm really blowing this for anyone who hasn't finished the book - there's Fawkes, is my answer. And thank you for giving me a chance to say that because people have argued that quite a lot.
JK Rowling at Carnegie Hall 10.20.07