The conversation between human and AI assistant.
What is the importance of the Ravenclaw diadem?
Who has possessed the diadem in the past?
The diadem was passed down in the Ravenclaw family until it was stolen by Rowena's daughter Helena. Helena then hid the diadem and died without revealing its location. It was later found by Tom Riddle (Voldemort), who turned it into a Horcrux.