Why the heat matters
Traditional repair uses a torch and solder, which heats a wider area. That's fine for many jobs, but heat can damage heat-sensitive stones, pearls, and enamel, and it can discolor or weaken nearby parts.
Because a laser weld is so small, stones close to the repair can often stay set while the work is done.
Repairs where laser welding helps
Re-tipping worn prongs, repairing thin or cracked shanks, fixing fine and hollow chains, closing small porosity holes, and repairs near stones that shouldn't be removed are all common uses.
When solder is still the better choice
Some joins are stronger or cleaner with traditional soldering, especially larger joins and certain metals. A good repairer chooses the method that suits the piece and explains why, rather than using one method for everything.