Rhodium On 925 Sterling Silver Round Clear Cz Dangle Charm Chain Necklace 16+2 Inches Extender Closed with spring clasp. Very secure. Rhodium plated over 925 Sterling silver (Stamped) with Clear CZ Size: approximately 16 inches with 2 inches extender, can be adjusted up to 18 inches Dangle Charm size: approximately 6mm high x 4mm wide Chain Thickness: approximately 1.2mm; Extender chain thickness: approximately 2mm