Ravenclaw's Diadem is a silver crown with the blue jewels in the middle.
See related links for a picture of the film prop that was displayed at Comic Con 2010.
The diadem (a crown) which belonged to Rowena Ravenclaw. It was stolen by her daughter, Helena Ravenclaw and wasn't found again until Lord Voldemort went looking for it in Albania. Voldemort then turned it into a Horcrus and left it in the Room of Requirement at Hogwarts where it remained until it was destroyed in a fire during the battle of Hogwarts.
The Ravenclaw house ghost it the Grey Lady. Her human name was Helena Ravenclaw who was the daughter of Rowena Ravenclaw who founded Ravenclaw house. Helena stole her mothers diadem and hid in Romania. Her mother sent the many who loved her, the Bloody Baron, to find her. She refused to go with him so he killed her then himself and that is why he wears his chains and is covered in blood. Tom Riddle convinced Helena to tell him where the diadem was then he turned it into a Horcrux which led Harry to the Room of Requirement where all hidden things were.
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).
Yes he found it at the end of the last book, it was in the ravenclaw common room.
the diary the, the ring, ravenclaw's lost diadem, the snake Nagini, the locket, hufflepuff's cup and Harry, himself
wit beyond measure, is man's greatest treasure
The diadem (a crown) which belonged to Rowena Ravenclaw. It was stolen by her daughter, Helena Ravenclaw and wasn't found again until Lord Voldemort went looking for it in Albania. Voldemort then turned it into a Horcrus and left it in the Room of Requirement at Hogwarts where it remained until it was destroyed in a fire during the battle of Hogwarts.
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).
He had doubts at one point because the diadem had supposedly been lost centuries before Voldemort's time.
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.
Yes, Cho Chang did try and take Harry to the Ravenclaw common room to look for the Lost Diadem in Harry Potter and the Deathly Hallows however Ginny was unhappy about this and suggested that Luna Lovegood took him.
Nagini (voldemorts snake), the lost diadem of Ravenclaw and Helga Hufflepuffs cup.
The Ravenclaw house ghost it the Grey Lady. Her human name was Helena Ravenclaw who was the daughter of Rowena Ravenclaw who founded Ravenclaw house. Helena stole her mothers diadem and hid in Romania. Her mother sent the many who loved her, the Bloody Baron, to find her. She refused to go with him so he killed her then himself and that is why he wears his chains and is covered in blood. Tom Riddle convinced Helena to tell him where the diadem was then he turned it into a Horcrux which led Harry to the Room of Requirement where all hidden things were.
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).
Yes he found it at the end of the last book, it was in the ravenclaw common room.
the diary the, the ring, ravenclaw's lost diadem, the snake Nagini, the locket, hufflepuff's cup and Harry, himself
The diary, Slytherin's locket, Hufflepuff's cup, the diadem of Ravenclaw, Nagini, the Resserection Stone ring, and Harry.