Vintage ring black and silver handmade ring size 8 southwestern boho

This unusual vintage ring has a carved black cabochon that is attached to the ring base with tiny metal posts that go from the front to the back. It is made of silver tone metal that I believe to be sterling silver, hasn't been tested. It does not stick to a magnet. There is a little stamp inside that looks like a number 2 in a circle. One of the posts is wiggly but still held secure. It is in good preowned condition with surface wear and dark patina, which I will leave unpolished. Ships fast! ZEBG8388R5J2