Pinterest, and think it interesting that it's superhumeral-shaped. What if superhumerals are not fabric, but metal?
I'm intrigued, as one of my inspiration pieces for my persona is Theodora with Attendants, which is a sixth century Byzantine mosaic in Ravenna, Italy. In that piece, the Empress is wearing what appears to be a separate collar, but with bezels and the like. Attaching said bezels to fabric is tricky, and can damage delicate fabrics (like silk). If it is a metal piece, like this, it makes more sense. Further more, the Berlin necklace has the same sorts of drops, similarly shaped bezels and prong settings, and does have pearl beads inset into bezels - much like Theodora's collar.
One thing I do find interesting is the loops on the back of the necklace. I'm thinking that this may have been tied shut and was therefore adjustable. It also could have been sewn to a fabric backing.
Also in the realm of cool are the headpins - which are really just eye pins folded under. The piercework is amazing, and the teeny-tiny hinges are gorgeous. I really, really want to try to make this piece.
It's something to think upon some more.