All precious metal will eventually tarnish. Some people actually like the way it looks better with a darker hue. But if not, there are ways to slow the process. Different environmental conditions and skin type can affect the jewelry more quickly. Air and light affects it the most—so if you keep your pieces in an airtight zip-lock baggie when you're not wearing them, they won't tarnish as quickly. People’s body chemistry can affect metal differently as well. Try to avoid wearing a lot of perfume or lotion around your pieces. They can be cleaned or polished with any polishing cloth or non-abrasive Silver polish. If your piece has any antiquing or oxidation in the design, don’t soak in a polish— it will take away the detail. Just rub it off with a cloth.