So what is Argentium, and why was it created? Argentium is one of a new generation of silver alloys. It was developed specifically to combat the tarnish that occurs as silver oxidises when it comes into contact with air, which is a major drawback for all who love silver. But that?s not the only reason. Argentium also boasts a whole range of other properties besides this, which help to make it an exceedingly clever alloy for those who choose to embrace it.