Spent a week in Cape May, NJ and hit the beach every day. Signals were few and far between but I lucked out and found a 10k wedding band. The larger ring, I believe, was a plated over silver. After I cleaned the black crust away there was a grayish layer, a barrier metal as I understand it, and beyond that it had all the characteristics of silver. There's a mark on the inside but it's hard to make out. I also found a couple bucks in clad but overall it was a very satisfying trip.