This ring was in need for a channel to be rebuilt. I was to only repair and rebuild the one channel on the sapphire/diamond band closest to the diamond band.
I first rolled a gold wire in the rolling mill to flatten it out. I gave a sweeping arch to match the channel.
I saw that it would be easier to unsolder the rings, so I could have better access to the side of the ring. I tacked the new channel in place with the laser welder.
I then flowed solder across the entire top.
Here is the new channel shown after the initial sanding.
Instead of sanding out the wear-and-tear scratches from the shank, I burnished out the dings with a tungsten burnisher.
I polished and soldered the rings back together.
Now it really shows how worn the other channel is. But it was a huge improvement. The ring looks great.