It involves the jeweler stretching the metal, and this can only be done up to half a size larger. If you need it to be larger, the jeweler will cut the strap and add an extra piece of metal, which it will then weld, clean and polish. As with making a smaller ring, simple bands are easier to make larger. A typical size change for a ring that is too small may involve the jeweler cutting off a small part of the band and then soldering it.
It is also possible to stretch the metal or add more metal to the band to make it larger. When you need to change the size of your ring and it is possible to stretch it, you should look for an expert jeweler to do so. It can be a simple or very complex process, depending on the ring you want to modify. Changing the ring size to make it larger is a more complicated process, but it can be done.
As with changing the size to a smaller size, if a band is a simple style, the process is much easier. The jeweler stretches the metal to make a larger ring, but this process can only be done up to half a size larger. If a ring must be larger than that size, the jeweler will cut the band to add additional metal. And usually, wedding rings made without stone are made to stretch, but the most complicated ones aren't.
These limitations can make it easier for you to decide. Whether you're looking to change the size of your wedding band, wedding ring, diamond ring, or whatever ring it is, don't worry.