Does anyone know any custom jewelers?

I am getting married next year and I want to use my dad’s old rings to make my wedding band. He passed away a few years ago.

My ring size is 12 and his was 6.5. So I’m looking for a jeweler who can melt down two of his rings and make one for me.

I have called several jewelry stores but they only buy or sell. They don’t melt down rings to make a new one.