Cockle Shell & Pebbles Silver Necklace 18 inch Sterling Silver Necklace £30.00 Out of stock. Made from silver wire, melted scrap silver and a shell cast directly from an original found right here in Pembrokeshire. This piece is a simple nod to the those sought after beach days. The ring measures approximately 12mm and has been hammered to add texture. Supplied on an 18 inch fine curb chain. Made by our local jewellery designer Karen at Serennu. Karen only works with 100% sterling silver and precious stones.