Sterling silver wire has long been the standard for making fine jewelry components and wire wrapped jewelry. Sterling silver is a precious metal alloy (blend) that contains at least 92.5% silver. This is why sterling jewelry supplies are sometimes marked with a ".925" or "925". The most common alloy is 92.5% silver and 7.5% copper. Sterling wire will naturally tarnish over time, and can also be oxidized to create an antiqued looked right away. If you want to keep your silver wire bright and shiny, choose Argentium sterling silver wire for a tarnish-resistant silver wire that still contains 92.5% pure silver.