Harry Potter Hermione Time Turner. In Chamber of Secrets the book preceeding Prisoner of Azkaban in which Hermione gets her Time-Turner Lucius Malfoy and his son Draco are overheard talking about how much of a problem Hermione is at Hogwarts by Harry in Borgin Burkes. Hermione is taking 2 or 3 classes for every 1 regular time period.

Quoting from Rowlings Pottermore article on Time Turners. To create this artifact graphic artist Miraphora Mina took inspiration from clocks and watches as well as astrological instruments such as astrolabes. Firstly I had Dumbledore and Hermione emphasise how dangerous it would be to be seen in the past to remind the reader that there might be unforeseen and dangerous consequences as well as solutions in time travel.
An authentic recreation of Hermiones TIME TURNER as featured in the movie Harry Potter and the Prisoner of AZKABAN.
Chain measures 18 inches. Obviously this is drastically subverted by the entire plot of Harry Potter and the Cursed Child where a new sort of time-turner one capable of going back multiple years is used to resurrect a major character. A Time-Turner is a magical object introduced in the third book. He rummaged in his inner pocket of his school robes and pulled from within Hermiones time turner.