Pure copper?

I wasnt sure this is truly 100% pure copper throughout. My hand didnt actually turn green. The other layer is all shiny, while the inner layer looks copper. There's also a thin distinct line around the bracelet as if separating 2 layers of metals. Look at the inner layer in the pic, and how shiny the other layer is which doesnt look like copper at all. I used to have copper bracelets and nothing look like this. The whole piece was the same color or very close. Not this one. Such a distinct separation of layers.

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