This is a large and ornate vintage Art Deco pendant with a carnelian glass molded stone set in a filigree setting with enamel highlights. It also has three small pink glass cabochons and a red rhinestone set in the bail. The metal looks to be silver over copper and the center stone is set on top of what looks like mother of pearl. I have listed this as Art Deco but I think it is a transitional piece and may be a bit earlier. It is on a sturdy silver colored chain which may be a later addition.
The pendant measures about 2 1/4 inches by 1 1/2 inches, not including the bail. The chain is 24 inches long. It is in very good condition with wear to the silver finish as shown.