How much does it cost to take the diamond off of an engagement ring and put onto a new band?

My girlfriend has stated that she loves her grandmas engagement ring, but I know she wants a white gold band instead. I wanted to know how much it would cost to have the diamond on her grandmas ring taken off and placed onto a new, white gold band. Thanks!|||Prices can vary depending on how complicated of setting you want it in. I would take it to a few different jewelers and price out different options. But honestly if she loves her grandma's ring and you take the diamonds out and put it into a new ring it's not really her grandma's ring anymore. If she wants a white gold band. I would invest your money into a new ring.|||About $50.