Congrats guy, nice find on the ring!
When I first started reading I was thinking silver plated pewter, but now more like white gold. The modern electronic testers have the ability to discriminate value from junk by reading the chemicals oxidized residue. For instance, if you've got a really fine sense of smell you can tell gold plated brass just by smelling it. What you're smelling is the brass oxides seeping out through the plating. You can also rub it between your fingers and smell them. You might check the specific gravity.
Good luck and best wishes!