The Time Turner was gifted to Hermione Granger in her third year to help her attend more classes. This gold-plated necklace features a spinning hourglass and an inscription around its edge. Just three turns should do it. 
 
Dimensions: 0.3 (w) x 0.3 (h) cm (charm), 25 inch chain
Packaging: Backing card with euro hook
Composition: Gold-plated