Gemming seems kind of sporratic. If you're just going to be tanking heroic 5 mans and stuff then gemming for threat might not be a bad thing, however if you're looking to start tanking raids and such, I would highly recommend starting to gem stam since your gear is still fairly new. Main focus at the moment should be getting a new weapon I think. Other than that general stuff I don't know nearly as much about paladins as some other people around here so I'll leave that to them.
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