Although platinum has its problems, as well. I think Argentium is pretty cool, but it would be significantly more difficult to find an Argentium setting. You'd almost certainly have to go to an actual jeweler.
Argentium is a type of sterling where the alloy is germanium. It is virtually tarnish-free like fine silver, but hard like sterling, so it holds up as a ring. It's also sterling silver (93% silver), so it's GOBS cheaper than gold or platinum, which means IrishinScranton could put more towards the stone. And tradition aside, silver is a whiter white than gold or platinum. Some would say it looks better.