Silver + Copper Green Stone Earrings

These are fully handmade sterling silver and copper earrings, made by creating a small sterling silver hoop dangling at the very bottom of a green crystal woven in with two copper beads. Unfortunately, the stone was gifted to me, and I am unsure of its property. I tried to look online, but found nothing that resembled it, but it is a true stone (it may possibly be green Italian onyx)