The products have been tested for weeks to make sure they don't stain your skin over time. It is advisable to remove them at night and to avoid contact with water. Depending on the type of skin and the wear time of the product as well as the use of this one, it is possible that the gold plating disappears little by little, in certain places. On the other hand, since the product is in 925 silver or 925 silver plated with 18K gold, it will always remain silver without becoming copper or dark gray in color and it will remain beautiful in appearance.