Details: 18K Gold Plated: 18K Gold over Copper base. 18K Gold Vermeil: 18K Gold over .925 Sterling Silver base. Width: 5mm Clasp Type: Lobster Lock Plating Techniques, Silver Coat, Vermeil Jewelry, Solid Gold Jewelry, Cuban Link Chain, Cuban Link, Gold Plated Jewelry, Jewelry Plate, Earring Necklace