When sizing a ring, what is the best method for rejoining the shank?
The best and most efficient method for rejoining a ring shank when sizing a ring up or down is with a torch using hard palladium solder. 1,400 or 1,500 palladium solder will work too but for the best color match and a strong bond, hard palladium solder is most desirable. Palladium is oxygen hungry and it is not realistic to use a torch to weld palladium without solder.