My girlfriend is allergic to the ring I gave her is there any way I can make so she can where it?

Was it gold silver tanzanite platinum you might have to get it in a different setup there's not a whole lot you can do about it but to get it in another setting.

Put a coat of clear nailpolish on the inside of the ring to seal of the surface. That way the material won't have direct contact with her skin and she should be fine. Make sure she renews the coat once in a while, though, as it will wear of after a while.