Both pairs are made with copper. The pair on the left are patinated with liver of sulfur. The pair on the right are just tumbled. Again, since I don't have stud sets, I made my own with 20g wire. I discovered it was easier to solder to the earring if I balled the end of the wire, put it in a drill gauge and hammered the ball so it was flat, like a nail head. It was difficult to get a good photo of them!