Argentium Silver is a modern Sterling Silver alloy. It was created by Peter Johns by replacing some of the traditional 7.5% copper with germanium. The addition of germanium to the alloy creates a silver alloy that does not tarnish easily, and is harder than traditional Sterling. These new properties make it ideal for use in making pen and money clips. Unfortunately the layer of germanium oxide that forms on the surface to protect the piece from tarnish, also prevents enamels from fusing to it.