The best way to care for silver jewelry is with a polishing cloth specially designed for silver.
Gold, platinum and diamond jewelry is best cleaned with mild soapy water. Even better is to visit your local jeweler. They will check your jewelry and use an ultrasonic machine to remove dirt, lotions etc., and a properly ventilated polishing wheel to brighten and remove some scratches on the metal.
For softer stones such as opal, pearls, coral, emeralds or fracture-filled stones should not be put in an ultrasonic. The crystalline structure can be altered and change the appearance of the stone. As for fracture-filled stones, the material can leach out and expose pockets or cracks. It’s best to use mild soapy water or bring to your local jeweler if you’re not sure. Also, large stones over 10 carats shouldn’t be in an ultrasonic because thermal shock can occur.
Do not use toothpaste or a toothbrush that has any toothpaste on it, as it’s too abrasive.
The best way to care for pearls is gently wiping with a soft damp cloth. Avoid swimming pools, hot tubs and working out in them. These all destroy the silk on which they are strung.