Product Description_x000D_ 925 silver means that the purity of silver is 92.5%, which has rational hardness, luster and resistance_x000D_ $Why does silver jewelry turn black after wearing for a long time_x000D_ 1. A chemical reaction between silver and sulfur molecules in the air produces a black chemical substance._x000D_ $ How to deal with blackened silver jewelry in daily life_x000D_ 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.$_x000D_ 2. Rinse with detergent and warm water into a solution, then wet the surface with phosphoric acid solution, then_x000D_After wiping with a flannel, the silver jewelry can be more clean._x000D_ $Great gifts for Mom or Grandma on Mother's Day, anniversary, birthday, or wedding celebration._x000D_ Specifications:_x000D_ Material: S925 Silver_x000D_ Main stone: zircon_x000D_ Size: length 4.5cm, width 1.6cm_x000D_ Packing list: a pair of earrings