Sterling Silver Cubic Zirconia Simulated Birthstone European-style Bead Charm Slide-on (not threaded) charm Solid 925 Sterling Silver in Polished Finish and Sparkling with Cubic Zirconia 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.