All jewelry, except solid gold items, can and will most likely tarnish at some point. To prevent this from happening, or to slow it down, it is best to keep jewelry dry and away from lotions, perfumes, and any other weird chemicals. This is especially the case with brass jewelry. Some jewelry will also react with water that has chemicals in it, like pools or hot tubs. You can clean most jewelry with a jewelry polishing cloth (Never use it on gold plated jewelry). You can also use a cleaning solution safe for your jewelry's material (except jewelry with gemstones. It could hurt the stone.) Also be careful with any rings that have gemstones in it when using a cloth. Try to avoid stones.