Story:
"Ravenclaw's Diadem was the only known relic once belonging to Rowena Ravenclaw, the founder of Ravenclaw House at Hogwarts School of Witchcraft and Wizardry. Etched upon its surface was Ravenclaw's famous quote: "Wit beyond measure is man's greatest treasure." It was said to enhance the wisdom of its wearer, which is Ravenclaw House's most treasured attribute. It has a blue sapphire shaped like an oval. The diadem was later stolen by her daughter, Helena, a fact Rowena kept a secret from the other founders 'till her death bed.
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. Her mother fell fatally ill and in spite of Helena's betrayal, wanted to see her daughter one last time. Rowena sent the Bloody Baron, a man who once loved Helena, to find her. 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. Upon her refusal to return with him, the Baron stabbed her; horrified by what he had just done, the Baron then stabbed himself as well. The diadem was later found to be lost (hence the name "the lost diadem"), and was sought after by students for hundreds of years."
Cache for Harry Potter fans :) which is hide in Albanian Tree in middle of Sarande