Harry Potter Sterling Silver Lightning Bolt and Glasses Slider Charm Harry Potter Sterling Silver Lightning Bolt and Glasses Slider Charm. The charm is made from Sterling Silver with a gold-plated lightning bolt and is compatible with our other Harry Potter slider charms, and bracelets. This design is an iconic one for any Harry Potter fan. The charm has been created using the style guide from Warner Bros and comes in an Harry Potter branded box which shows the Warner Bros logo. There is a matching necklace, earrings and ring in this collection. The Carat Shop are the licensed manufacturers of Harry Potter Jewellery on behalf of Warner Bros.