Every charming Harper look begins at the base. The Harper Ball Chain Necklace is rhodium or gold-plated with a smooth, polished finish. Designed to beautifully donn all of the romantic charms included in this collection. How it works:Make it ClickWhen pairing with a Harper Charm, you'll need to hear a click to make sure your charm is securely fastened. Mix-n-MatchAll Harper Charms and Harper Bases are interchangeable and easy to mix-n-match.