I can't see a stamp, but as far as I know, it's solid sterling. I got it not too long ago, and it was sold as 925 sterling, not sterling plated. I never buy those. Once it wears off, it turns a copper color. This has held up well. I'm just getting rid of rings because I have so, so many.
The ring is not stamped 925, but it was sold to me as sterling, and by the looks of it inside and outside, it truly looks like sterling. The color is the same after wearing it and cleaning it in silver cleaner, and it hasn't had any discoloration. I trust the Seller also who I bought it from.
I have these really strong magnets on my refrigerator, and the ring fell to the floor when I tried to see if it stuck. It will not stay on magnet at all.