Non-tarnish alloys are relatively new to the market. Argentium is one brand of these alloys, but there are others available that are similar. These alloys contain a minimum of 92.5% silver, with some slightly higher in silver content. The remainder consists of copper and the addition of the element germanium. The germanium makes the alloy harder and more tarnish-resistant. Non-tarnish alloys can still tarnish under extreme conditions over extended periods of time, but they will normally require less maintenance than sterling. Argentium is significantly more expensive than sterling and less readily available. It is hard to distinguish from sterling because the quality stamp is still .925. Manufacturers can go through an application process to receive authorization to use the Argentium® mark, but this stamp impractical for many jewelry pieces because of its large size.