A lost crown that once belonged to Helena Ravenclaw. Her daughter, the Grey Lady, stole it and took it to Albania where is was considered lost. Lord Voldemort discovered it, turned it into a Horcrux and hid it inside the Room of Requirement at Hogwarts.
He hid it inside the room when it was turned into a place to hide things, Harry Potter hid the Half-Blood Prince potion book in there the year before so he knew what it was. Voldemort thought nobody else would ever come across the room.
the ghost of Rowena's daughter Helena tells them a clue which leads them to the Room of Requirement where Harry finds it in a jewellery box.
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Vincent Crabbe destroyed the diadem when he used fiendfyre (cursed fire) on it, while trying to kill Harry Potter (along with Ron Weasley and Hermione Granger).
Well, actually Rowena Ravenclaw's magical Diadem was stolen by her own daughter - The Grey Lady - the ghost of Ravenclaw House. After that The Grey Lady flees. Rowena asks The Grey Lady's lover to go & find her but instead he kills her. But before that The Grey lady manages to hide The Diadem in a stump of a tree by magic. The Grey Lady's lover was The Bloody Baron - the ghost of Slytherin House. He finds and kills her, I don't remember why. That's the reason he has blood on his robes. Many years later Tom Riddle discovers from The Grey Lady the location of the Diadem, finds it and turns it into a Horcrux.
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Rowena Ravenclaw's lost diadem
The answer I believe is 'diadem'. In Harry potter, they are in search of ravenclaws lost diadem and it turns out to be a tiara
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He tried to get objects from each of the four founders of Hogwarts.Slytherin: Salazar Slytherin's LocketHufflepuff: Helga Hufflepuff's CupRavenclaw: Rowena Ravelclaw's DiademNone from Gryffindor, unless you count Harry Potter, who was not meant by Voldemort to be a horcrux, and isn't technically an object.
wit beyond measure, is man's greatest treasure
Vincent Crabbe destroyed the diadem when he used fiendfyre (cursed fire) on it, while trying to kill Harry Potter (along with Ron Weasley and Hermione Granger).
Well, actually Rowena Ravenclaw's magical Diadem was stolen by her own daughter - The Grey Lady - the ghost of Ravenclaw House. After that The Grey Lady flees. Rowena asks The Grey Lady's lover to go & find her but instead he kills her. But before that The Grey lady manages to hide The Diadem in a stump of a tree by magic. The Grey Lady's lover was The Bloody Baron - the ghost of Slytherin House. He finds and kills her, I don't remember why. That's the reason he has blood on his robes. Many years later Tom Riddle discovers from The Grey Lady the location of the Diadem, finds it and turns it into a Horcrux.
In the Room of Requirement
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Rowena Ravenclaw's lost diadem
Its like a crown or a tiara inscribed with the words "Wit, beyond measure, is man's greatest treasure." Rowena Ravenclaw used to own this when she was alive. It it one of the horcruxes. It is destroyed by Fiendfyre, or cursed fire, in the last book. When Rowena Ravenclaw owned the diadem, her daughter Helena Ravenclaw (who is now the Ravenclaw ghost) stole it and ran away. Rowena sent the Bloody Barron to bring her back. When he found her he asked Helen to come back, she refused, and then out of rage the Bloody Barron killed her. After he realized what he had done, he killed himself (he is now the Slytherin Ghost).
The seven horcruxes in Harry Potter series are as follows: Tom Marvolo Riddle's diary of his 16th year Marvolo Gaunt's Slytherin ring Salazar Slytherin's locket Helga Hufflepuff's cup Rowena Ravenclaw's diadem Harry Potter Nagini
A diadem is a jeweled crown worn as a symbol of sovereignty. The diadem in the Harry Potter books is Rowena Ravenclaw's and it was believed that it bestowed apon the wearer incredible wit. It was stolen by her daughter a long time ago and was lost. This is why the diadem is refered to as "the lost diadem of Ravenclaw" In the last part of the book, Harry and his friends believe it is a horcrux and contains a piece of Lord Voldemorts soul. Voldemort cannot die without all the horcruxes being destroyed so therefore, Harry needs to destroy the diadem. The only problem is that it is lost.