ProductDescription 925 silver means that the purity of silver is 92.5%, which has rational hardness, luster and resistance $Why does silver jewelry turn black after wearing for a long time 1. A chemical reaction between silver and sulfur molecules in the air produces a black chemical substance. $ How to deal with blackened silver jewelry in daily life 1. You can try to apply a little toothpaste on the surface of the silverware, and then wipe it with a toothbrush dipped in warm water.$ 2. Rinse with detergent and warm water into a solution, then wet the surface with phosphoric acid solution, then_ _After wiping with a flannel, the silver jewelry can be more clean. $Great gifts for Mom or Grandma on Mother's Day, anniversary, birthday, or wedding celebration. Specifications: Material: S925 Silver Size: length 3.4cm, width 1.3cm Packing list: a pair of earrings