925 silver oxidizes! The silver oxidation process is very normal because when it comes into contact with oxygen, air and the environment moisture, turns yellow and then black. Also if it is 925 silver comes into contact with materials containing sulfur can trigger this process more quickly.
It should be noted that not all 925 silver pieces pass through this process in the same way or at the same time, since there are factors that can intervene or favor this, such as the pH of the skin, water, the beauty products we use, where we store that, etc.
However, 925 silver is a super noble material that, despite being oxidized by any external factor, it can return to its original state with a simple cleaning process. In the next few days we will be Uploading a blog article on how you can do it. I hope this article has clarified your doubts regarding This material is as noble as 925 silver. This will always be the best option to make your jewelry purchases.