Vintage Jewelry White Layered Necklace 009

Possible bone or shell but unsure. Reminds me of something someone would wear in the Caribbean. Measures approx. 17" across with a screw clasp for the. Weighs approx. 1 ounce. Needs a good cleaning. We are not jewelry experts - we've simply been buying pieces we love for over 35 years. We don't know the actual age or correct verbiage and can't describe them using the "proper" terms, so our photos are our description.