Fabulous bib necklace is copper wire with polished green stone centre

A beautifully crafted piece with a curved open back that holds securely but allows easy adjustment for size and comfort. The mottled stone in a deep, rich green - serpentine I think - measures 1-3/4"X1-1/4". It is wrapped in copper wire and is polished on both sides, but the back side is flat. No markings. In great condition - the copper wire around the neck is malleable so is easily bent, but just as easily unbent. (d)