These are hand-made, laser etched necklaces out of finished cherry plywood, with paua shell inlay. Each piece is unique, and glows rather wonderfully in the light. The cherry is finished on both sides, so it doesn't absorb moisure, and is decently water resistant, and the shell inlay is fitted into place with a very durable adhesive.
The fittings are antiqued brass on a silk satin cord, 20" in length, with a 2" chain extension.
Since the shell and the wood are both natural products, there's some variance from piece to piece.
For a closer look at: