I really like this design.  Of course, the balls fell off during various stages of the process:  right after soldering, in the pickle and even when I began filing.  You will notice the middle ball is still round.  I now know I will need to either make the balls slightly bigger or the dome slightly more shallow.  Thanks for another great project, Joanne!

Update:  I made a pair of the stud earrings this weekend but can't figure out how to add a photo.  When I click on the "Add Content: Image" and put in the photo of the studs, the photo is huge.  Any suggestions appreciated!