Mixed metal bone mid century modern statement necklace copper brass tribal

A great vintage mixed metal necklace, made of copper, nickel ( we believe) and brass on what looks to be bone. a 17.5" necklace We did a bit of research, and there are similar necklaces like this, with the description being ebony wood, but we cannot guarantee that to be true. Holding the back to the light, there are striations in the material, of lighter color, like what you would see in bone. The necklace is in good condition, with some minor scuffs here and there on the metal. We do not clean with any chemicals, just a cloth. We leave that up to the buyer.