Earrings

How often you clean your jewelry depends on how often it is worn, says Kathleen Plate, the founder of Smart Glass Jewelry. "Pieces that get dirtier more often, like earrings, can be cleaned as needed or bi-weekly, depending on how dirty they get," says Andrew Brown, a celebrated diamond expert and CEO of WP Diamonds. Otherwise, you should aim to clean all of your jewelry at least once a month. Without routine cleanings, "the jewelry becomes darker, less colorful, loses its luster and sparkle—and ultimately it's less hygienic," he says.