This is an official Warner Bros. licensed replica of Hermione’s time turner used in Prisoner of Azkaban. It’s 18″ long and plated in 24K gold, and it comes in a display case as seen in the photos. While it is wearable, it’s advisable to treat it carefully as it is a collectible.
Available on Amazon Prime for only $49. Also available from WB Shop for $59.95, but sometimes they have sales.