The other day, I posted a tutorial about how to make these earrings.
Here is a variation on the same theme:
Circle Pendant Necklace with Lemon Quartz
In this example, I used a round mandrel and twisted 22g wire at the "4" mark. I then completed all the steps in the tutorial with one exception: instead of lying the jump ring flat against the circle, I soldered it side ways so that the pendant would hang from a chain properly. This is a bit trickier than doing it flat, but I used two third hands to make it less awkward. As a finishing touch, I hammered each side of the wire before polishing the pendant. I think it would also be cool to just hammer one side, sort of like a half moon type look.