Vintage Left Facing Cameo Black with Pearls

Vintage Iridescent Cameo set on black stone encircled with pearls and black stones on a gold tone setting I’m not sure what material the cameo and stone are. The Cameo has a pearlescent shine and may be MOP or shell. The black setting may be onyx or glass. Pics appear to have spots on the front but it’s reflection from the light Overall it is a beautiful brooch and in great condition! Reasonable offers only please ;)