Sterling silver is a precious metal that can naturally develop a patina over time. This evolution is part of its beauty. That said, if you want to restore its shine, gently clean it with a polishing cloth, warm water, and mild soap, or occasionally with a paste of baking soda and water applied gently to the metal. Avoid chemicals, acidic solutions, perfume, or cosmetics. When you're not wearing it, store your jewelry away from moisture, ideally in a pouch or closed box.