Sterling Silver Cubic Zirconia Simulated October Birthstone Heart European Style Bead Charm Slide-on (Not Threaded) Charm Solid 925 Sterling Silver in Antiqued Finish Approximately 4.5mm Hole Size Fully compatible with European-style Charm Bracelets such as Pandora, Troll, Biagi, Persona, Ohm, Kay's Charmed Memories and More.