Probably the easiest options are silver or zinc. Silver is pretty inexpensive these days, and easy to plate (from what I've heard, I've never done it). Silver plating kits are readily available and not that expensive.
Zinc would also work, and of course very inexpensive, but the finish would not be as nice, and zinc, in constant contact with skin would probably dull pretty fast. Zinc protects well because it sacrifices itself easily .... natural acids and such on skin would probably break it down fairly quickly.
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