Why did Voldemort hide the diadem in the Room of Requirement?

Tom Riddle Riddle was arrogant enough to believe that he alone had penetrated Hogwarts’ most mysterious secrets, and thus he believed that only he had discovered the Room of Requirement, where he intended to hide the diadem.

How did Harry know where the diadem was?

In the movie, the diadem was found by Harry in a jewelry display case by listening for Horcruxes (This never happened in the books! He never “heard” or felt the Horcruxes). The answers above answer how he knew where to find it in the books. In the movie they used a plot device to lead him to it.

How did the diadem get into the Room of Requirement?

The diadem is hidden by the room. The only way to get it is to look for the hidden diadem of Ravenclaw outside of the room. And the only reason Harry & Co find it, is because they think it is there.

Where did Helena Ravenclaw hide the diadem?

Albania
When he caught up with her in a forest in Albania (the same forest Lord Voldemort would use as a hiding place during his exile), she hid the diadem in a hollow tree.

How is the diadem destroyed in the book?

Hermione Granger and Ron Weasley destroy the Hufflepuff’s cup Horcrux inside the Chamber of Secrets — Hermione giving it the fatal blow with a basilisk fang. Vincent Crabbe inadvertently destroys Rowena Ravenclaw’s diadem in the Room of Requirement. It is stabbed with a basilisk fang and then kicked into a Fiendfyre.

Why did fire destroy the diadem?

The actual fire is nearly uncontrollable and burns at a much higher temperature than normal which could be the reason that it is able to destroy horcruxes.

What did the Grey Lady ask Harry about the lost diadem?

Shortly before the start of the Battle of Hogwarts, Harry Potter questioned the Grey Lady if she knew anything about the Lost Diadem of Ravenclaw, that he suspected was one of Lord Voldemort ‘s Horcruxes.

Who stopped Harry Potter from getting the diadem?

As Harry, Ron, and Hermione entered the Room, they split up into adjacent aisles between the towering piles of assorted discarded objects. Draco Malfoy, Vincent Crabbe, and Gregory Goyle followed Harry and stopped him. Initially, Harry was frustrated that he was so close to the diadem, but was held up by Malfoy and his cronies.

Why didn’t Ron and Hermione enter the room of requirement together?

Harry, Ron and Hermione don’t enter the Room of Requirement at the same time. Harry ran across the castle, chased by unfriendly spells in the Hall of Hexes, while Ron and Hermione were studying the Marauder’s Map at the time. Harry’s explanation that he saw the diadem before was omitted.

How did Rowena die in Harry Potter?

Rowena died shortly after her daughter, Helena, stole the diadem. Helena Ravenclaw, Rowena’s daughter, greatly envied the attention her mother received. She stole her mother’s diadem, in hope of using its power to make herself wiser, and fled Hogwarts.