Antique Native American Zuni brooch

Antique Native American Zuni brooch

antique Native American Zuni brooch. I am not sure of the tribe though I would guess Pueblo, or perhaps Navajo. Unable to find any markings, but metal tested as sterling silver. Stones include black onyx, turquoise, mother of pearl & coral Measures approximately 1.5" in diameter.

Main Stone
Black Onyx