Rather, they have most likely caused a joint, bone, ligament or tendon injury due to overstraining, pinched nerve, or similar causes. While heart attack warning is usually connected with the pain in a woman's left arm, the right one, if hurting, is probably injured. The cause may be a simple night of sleeping while holding your right arm in an unnatural position.
As brass hardware ages, its surface oxidizes, which leaves a layer of tarnish over the hardware. Over time, an additional protective layer, called a patina, forms over the untreated tarnished brass.
It all depends on what the alloy mixture is. An alloy is a mixture of two or more elements. Metals like nickel, copper and brass are often found in the alloys of cheaper rings and they will tarnish and/or turn your finger green. If you do have a ring like this, you could try painting the inside of the ring with clear nail polish before it is worn.