Official Harry Potter Time Turner Keyring Time Turner Keyring on a silver plated ring and clip Worn by Hermione Granger, the Time Turner played a huge part in the Prisoner of Azkaban This keyring has been created using the official style guide from Warner Bros. They are approx 50mm. It comes on official Harry Potter branded card packaging and shows the Warner Bros logo on the reverse. The Carat Shop are the official licensed manufacturers of Harry Potter Jewellery on behalf of Warner Bros.