I just went on the website I got it from. It has been tested and it says it is genuine sterling silver and genuine Mystic Topaz. They do have some rings that look almost identical that are sterling silver plated and stamped 925, so I understand why you are asking. Because of your inquiry, I sent the company an email asking about the testing of these rings. I also asked them why they stamp some of the rings 925 if some of them are plated and not genuine sterling silver. I will see what they have to say when they reply back to me. Thanks for the inquiry. Now I'm going to really take my time and look into each products description before I buy from this company again. Thanks for stopping by my auction too.