Vintage Mexican aztec tribal carved jade copper neckless

As you will see by the last photo this neckless is selling for $300. Because I do not have( never had) the three strands of beads that hang from the bottom I'm asking alot less for it. I'm sure a local jewelry artist could make something similar or even someone on Etsy, I wore it as is and was just as happy. It dates back to 50s -60s. It is also stamped Mexico on the back, see photo.