Just wanted to post a correction to some info. Argentium does tarnish. It just does so quite a bit slower than the usual Sterling. When Argentium tarnishes, it gets a bit of a tinge which isn't nearly as attractive as regular Sterling. Because of that I went back to Sterling for most jewelry fabrication work. There are also some hardness differences, considerable differences in heat treating, differences in the solders for each, Argentium fuses beautifully but regular Sterling is too risky, etc.
Gerald