Soft Solder & Flux for making jewelry, from Rings & Things.
Soft solder is a low-temperature tin-based solder, perfect for making glass frame pendants, repairing costume jewelry, and soldering pin backs or barrette backs onto metal jewelry when you want a connection more permanent than glue.
Soft solder is normally used with a soldering iron - and it's easy to learn! If you're careful, you can also use a torch with soft solder. (Just be careful not to overheat your components.)
Note: If you use soft solder on sterling silver jewelry, you lose the ability to silver solder the item in the future. (It forms a new alloy, and lowers the melting point of your sterling silver.)