I changed them myself.. I had 3 sets of rubies that came with c-rings that I decided to see what they would look like. I did this back in 2001 and havent changed them or pulled them out for that matter!! I originally sent them to oakley to do.. but after they got there, i figured that if anyone messes them up it should be me.. so i had them sell the 3 sets and send rings with them back to me to be changeout