Diamonds are not stamped .925. The silver is. You have to be sure that it is in fact stamper .925 if you're posting this as a 'sterling silver' ring or the winner can get their credits back for you labeling this incorrectly. Just thought you might want a heads up.
Just a FYI.......I totally learned that lesson. I had an bracelet on auction and it was stamped 925 and I listed it like that and come to find out when the winner received it he did a test on it and according to him it was not silver as far as i knew it was i had the bracelet for a few years and wore it all the time so even if it says 925 it still doesn't guarantee that it's silver the winner ended up getting his credits back. I even had pictures of the 925 inside the band of the bracelet. So just be careful with how you word things unless you have proof from a jewlers that it is in fact real silver.