Over time debris, skin particles, and beauty products can cause your stones to look dull. Simply use a soft bristle brush, mild soap, and lukewarm water and brush back and forth, making sure to reach all crevices. Your stone should sparkle as it did when you first purchased your piece. If not, that means your stone has surface scratches and will have to be professionally polished.
Metal will tarnish over time. We recommend using a jewelers cloth to bring back luster into your dull metal. Jewelry that has become dull due to surface scratches will need to be professionally buffed out.