The Diadem of Ravenclaw is a magical artifact associated with the Hogwarts School of Witchcraft and Wizardry's Ravenclaw house. It is said to enhance the wisdom and intelligence of its wearer. The diadem is adorned with a blue stone and features an intricate design, reflecting the values of its founder, Rowena Ravenclaw. In the Harry Potter series, the diadem becomes one of the seven Horcruxes created by the dark wizard Lord Voldemort. It is hidden in the Room of Requirement at Hogwarts, making it a significant object in the quest to defeat Voldemort. The diadem symbolizes the pursuit of knowledge and the importance of learning.