Your wedding ring is one that you want to wear most of the time, taking it off only when you do something that could result in damage to you or the ring, like getting an x-ray or kneading raw meat. If your ring is too large, either because you didn't know how to size rings properly when you got it or because you've lost weight, resizing is a necessity. You don't want your ring falling off. You also don't want any prongs or gems on the ring slipping to the side and possibly scratching the skin on an adjacent finger. But the type of resizing that is best will differ depending on the ring. Some lend themselves very well to being cut while others do not.
For Sets, Intricate Designs, or Gem-Filled Designs: An Insert or Sizing Assistant
If the ring is part of a set where one band curves around the other, if the design is very intricate and has a lot of details, or if the ring is filled with gems, such as an eternity ring, cutting isn't an option. Removing a portion of the ring would ruin the design, possibly make the set not fit well, and result in gems you paid for being removed. And while both rings in a set can be cut equally, one small mistake can mean a newly mismatched set.
For these rings, an insert or "sizing assistant" is best. These take several forms, from plastic sleeves you can buy online and cut down to size, too small springs or beads a jeweler can add to the side of the ring that rests against your finger. These fill the extra space and make the ring sit more snugly against your skin.
For Plain Bands: Cutting and Soldering
Plain bands, be they simple gold bands without stones or engravings, or a ring where the gems and details are on one part only, are the best candidates for cutting and soldering. This process is exactly what you think it is; part of the metal is cut out, and the two ends of the remaining band are soldered together so as to leave no trace of the cut behind.
For Bony Joints: A Removable Sizing Assistant
Sometimes the real problem isn't the ring, but your bony joints on your fingers. Rings have to be able to fit over the knuckle on your finger. They are supposed to be snug and drag a bit across your skin, but you should be able to push the ring on without it getting stuck at the knuckle bone. However, if the joints are very wide compared to the section of your finger between the joint and the knuckle on your hand, any ring that fits over the joint is going to seem to be too loose. In that case, talk to a jeweler about a removable sizing assistant, one that you can pull off the ring before you try to slide it over the joint.
No matter the problem with the ring size, there is a solution. Wedding rings are used by so many people and have been used for so long that pretty much every conceivable resizing situation has occurred somewhere. If you need to make your wedding ring smaller, you'll be able to do so.
For resizing options for a wedding ring, reach out to a local professional.