Abalone Shell Rainbow Necklace 26" Vintage Black Celtic Moon 90s Graduated Retro

This is a Link Necklace with a sort of plastic or acrylic flat graduated beads. It is a vintage 90s style, statement piece of costume jewelry. The beads are black outside and abalone shells (guess) on the inside. The inside has a rainbow of colored shells in Blue, Green, Red, Pink, Yellow and Orange. You can wear this necklace either side and still get the bright looking shells showing through. I would call these shaped in a kind of Celtic moon shaped beads. Source unknown, metal unknown, silvertone lobster claw closure. Approx. 26" when open and laid flat. I bought it in a store in London and brought it back to Kentucky where I will mail it to you from there.