Green Onyx. I LOVE this stone and this color so much! It can appear completely opaque or translucent, depending on the cut and the light. And honestly, it looks like emerald to me too. In this necklace I have used the stone in two ways, the bezel set irregular shapes I just adore, and the gem stone wire wrapped chain is the perfect companion. All in the rich emerald green color and oxidized sterling silver to give it the ancient heirloom feel I love. The necklace measures approximately 22" around the neck with another 5 or so inches in the tassel. There is an extension chain in the back giving you more room around the neck and more length overall. This is a gorgeous addition to your Fall collection and Holiday ideas! You will love how beautiful this looks on you!