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The Lost Diadem of Ravenclaw is a fictional heirloom which belonged to Rowena Ravenclaw, until her daughter stole it from her. It later went under the possession of Tom Riddle, who placed a part of his soul into it, making it a Horcrux, and hid it in the Room of Requirement.

While the entire Harry Potter saga is fiction, within the story line the Ravenclaw diadem was real.

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