You will need a re-fillable micro torch for thin rings, jump rings and chains, so you might as well shop for the cheapest on line.
Soldering a bangle however thin, is quite a different matter, because its size aids the loss of heat so fast that it won't get hot enough to solder with a small torch.
There are larger hand held torches, but you will probably need two (or one of each) used together, for bangles.
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