The stamped parts of this striking piece exhibit typical Navajo (Dine) style stamping, with an interesting mosaic inlay pendant in Pueblo (probably Zuni) style, using the typical materials (mother of pearl, jet, coral and turquoise) and geometric motifs. Interesting how the components may have become 'married.' The mosaic portion may have been picked up in trade and inserted into a bezel with Navajo stamping.
Or it's a Southwestern 'artisan' piece, combining components from several older pieces of jewelry. The top piece looks like quite old-style Navajo stamping. Measures 4 1/4" long by 1 3/4" wide.