This wedding set got a total freshing up. The marquise head was in bad shape and the channels were quite worn. I started by separating the two rings and removed the old marquise head. I laser welded on a new channel wire for the side diamonds.
One side redone.
With a new peg for the center stone and a few prongs retipped on the ring guard, a repolish/refinish and this ring looks brand new.
76021
Atlas Jewelers Bench Talk 
Before you started the repair, it looked like it had been chewed on by acid!!!
Certainly is beautiful now–great job!