intage Native American sterling silver, turquoise, coral and what appears to be onyx and mother of pearl round pendant / pin combination.  It is 1" round.  The back has a loop for a chain, as well as a pin with closure.  It is very finely detailed.  Purchased in Arizona from an Indian reservation in the 1970's.  Nice condition, very unique and versatile.

Much nicer than the photo shows.  The mother of pearl is luminous and glowing, and the colors are more "clean" than photo. Reverse side is smooth and polished silver.