Antique Hopi Indian Ceremonial Rings

There wasn't much I can find about these rings. I was asked by a friend if I could possibly sell them for her. However, the buy was a rather impulsive one on her part at an auction a while back. I mean to say that she barely knows anything about them either. So I found this site and posted this to see if anyone with more knowledge of the objects would be so kind as to enlighten me. It would be greatly appreciated.

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