Sterling Silver Ring Size 8.25 Band with Purple Stone Amethyst?

Up for auction a vintage, I think, Sterling Silver ring. I place ring on sizer and it drops between a size 8 and 8.25, see pictures. I do not know anything about item, so please look at all pictures as they are part of description. The stone looks like a light purple, lab created, I think, not sure. Àpprox. weight and measurements are in photos. Ring is in very good used condition and may have light marks and or scratches here and there, see pictures. Inside reads 925 A. Any questions please ask, no returns.