You need not clean your diamond jewelry regularly. Cleaning them once in a while is okay. To clean them, take a few drops of a mild dishwashing liquid with some warm water in a small bowl. Use a soft-bristled toothbrush, soft cloth, or cotton swab to dip into the soap mixture and then gently scrub the stone and the metal. You can also soak your earrings in this solution up to 30 minutes as an alternative.