Those are going to be mostly solid metal, so they're going to have very low resistance. Worst case scenario, you have a silver ring, which has the lowest resist

Those are going to be mostly solid metal, so they're going to have very low resistance. Worst case scenario, you have a silver ring, which has the lowest resistance of any common metal at normal temperatures. Even at a high value of 0.1 ohms (it's sure to be much lower than that), you're looking at 1440 watts, around the heat produced by many plug-in heaters in the US.