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21 hours agoI don’t know how much you want to spend or how many other things you might want to preserve. But they actually make specific lacquers for jewelry.
You can also find them on Amazon.
I bought the one on Amazon, it was absurdly expensive for what it is, but I wanted to protect a slice of meteorite from rusting.
I don’t, but all I did was buy a cut price of meteor and some decorative wire and pliers. Practiced wrapping it until it didn’t look awful, then dipped it in the lacquer.