Question

Who told Voldemort where The Lost Diadem is?

Answer 1

n the novel, the diadem is inadvertently destroyed by Vincent Crabbe's Fiendfyre inside the Room of Requirement. In Harry Potter and the Deathly Hallows: Part 2, Harry stabs the diadem with a basilisk fang and Ron kicks it to the Fiendfyre (then created by Gregory Goyle).

Answer 2

Helena Ravenclaw told Voldemort where the Lost Diadem was.

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