My wife's ring needs to be resized from a 4 to a 4.5, and a local jeweler said the process would involve cutting the band and inserting some additional material. Have any of you had this done, and were you satisfied with the results? It's my understanding that some rings can be stretched without cutting, but this jeweler made it sound like that wouldn't be possible with my wife's Tiffany-style four prong setting. Anyone in the know, does this sound right?

Thanks!