Two snake rings real Sliver

I have about 10 snake rings now, these were part of my collection, and as much as I love them I lost weight after being ill for some time and I just don’t believe I’ll gain that much back. They fit like a size 8 best I can tell these are unisex rings very stunning I know the silver one is real I bought it in store and it does not turn my finger green. The black one I’m not sure what it is. It a gift from a friend but also very sturdy and does not turn my finger green. Only sold together I’m selling here and on Mercari if this post is still up they are still for sale I will take both post down if this item sells will ship next business day USPS.