Yep, Plat (PT) sounds just like gold, and is worth a little more than gold right now...also keep your eye out for Palladium, its marked "PD" and is in the 600's per oz I think..plat does look like silver, but so does stainless steel and they sound like gold or plat too...if its not marked its probably stainless steel, if you heat it up with a propane torch and it does not discolor, it could be Plat...SS will discolor. If its nots marked its most likely some sort of junk..now they are even making class rings out of a chrome nickel amalgam called "lustrium" which is junk, and looks like silver or something.....lots of junk rings out there, but when you get the real deal, its all worth it! Good Luck and let us know.
Mud