Bling Jewelry Black Murano glass Lampwork Simulated Onyx Gold Foil Bead Charm .925 Silver This simulated onyx black murano glass bead has sparkling gold foil and a 5mm unthreadeded, sterling silver core making it a beautiful addition to your bead story. 100% safe for sensitive skin. Copper and allergy free. Material: .925 Sterling Silver, Gold Foil, Murano glass Lampwork Measure: 5 mm Bead Core Weight: 1.8 Grams Compatible with Pandora Charms, Biagi, Troll, Chamilia, European Style, Persona, Ohm, Kay&#039;s Charmed Memories and More. Fits both necklace and bracelet 3mm or smaller. The Unthreaded Hole Size is about 4.8mm-5mm.