Ladies Silver Oval Gray Mood Stone Ring Size 8 Stamped S. Mood Stone

Nice ladies silver color ring in a size 8. This is stamped S. MOOD STONE and 8 1/4 on the band - but my ring sizer show this as a size 8. There looks to be some additional writing but I can’t make out what it says. I am not sure if this is sterling since there are no marks. It looks to have scratches/tarnish on it from normal wear. Please see all photos as they are part of the description.