Hi Hans,
what an interesting necklace! I like it a lot. In my collection I have just a necklace made of insect parts. It is made by the thoracic segment of stag beetles called prothorax and is from Yuat River region, Papua NG. I bought two in Cairns, N. Queensland, thirty years ago. I gave one to a friend: it was eaten in few days possibly by carpet beetles. Mine is still safe in an entomological box with a small amount of natural camphor.
Giorgio