Harry Potter - Ravenclaw Diadem This stunning Harry Potter replica is based on Rowena Ravenclaw's lost diadem that Voldemort turns into one of his Horcruxes. Etched upon the surface of the diadem is the quote: "Wit beyond measure is man's greatest treasure." This exquisite replica is made of high quality silver-plated brass and it features blue and white crystals. One size fits most, and the diadem measures approximately 14 inches in length with a width of 5 inches and 2 inches in height. The diadem comes in a display box.