The gemmed center piece is fixed and measures approximately 7/8".
Date posted: 9/25/2012
I was excited to get these. At first I couldn't get them in my ear since I have a lump on one side. So I put them away thinking that I wouldn't be able to wear them. On a random day I decided to try again. I went to unscrew the ball, but it unexpectedly unscrewed from the center instead. I had no I idea they were meant to do this. I could actually get them in this way. I'm very happy with this piece of jewelry.