Harry Potter Time Turner Necklace

“I mark the hours, every one, Nor have I yet outrun the Sun. My use and value, unto you, Are gauged by what you have to do.”
—Inscription on Hermione Granger’s Time-Turner

A Time-Turner is a special timepiece in which an Hour-Reversal Charm has been encased, for added stability. It is a device used for time travel, and it resembles an hourglass on a necklace. The number of times one turns the hourglass corresponds to the number of hours one travels back in time.