Vintage Mosaic Inlay Shell Pendant

Vintage mosaic inlaid pendant made using a orange spiny oyster shell. Inlay is comprised of sterling silver (used for edging), jet, chip turquoise, and several pieces of coral, including a larger piece of coral emerging from the surface of the shell.  Sterling silver bale is attached to inner surface of the shell. Next to it is a small turquoise bead. Hallmark, McL, is stamped on the bale and is also written on shell. Is the hallmark for Mary Coriz Lovato, Kewa (Santo Domingo Pueblo).