Franz- Send it to Diana. They gave the warrenty. When you take in a
sizing or repair job you are married to that piece for life.
You could try stretching it on a ring stretcher, but you run a fair
risk of the three separating and having to solder it all back
The proper way to size a two tone band is to separate the three
Remove any solder that held them together. Size them up by adding
gold and platinum, then fusing them without solder. Then solder the
three back together with solder. I can do that sort of work, but it’d
cost the client at least 300 bucks. I figure it’d take me at least an
hour plus materials.
Have fun and make lots of jewelry.