I don't know what the gauge size is. It was a gift but from what it looks like, it should be the gauge size you would use after you get the ring out that they put in when you first get your tongue pierced. Sorry I don't know exactly what size it is but I've never worn it. It's to shiny: I wear a small clear plastic ball ring because at work we are not allowed tongue rings :-( So I wear the clear plastic one and so good so far, LOL no one has noticed or if they have, they haven't said anything :-)
it's really ok. i'd most likely put it in my ear XD cause i like having weird like earrings? and i really wanted a crystal heart so this is really perfect and my ear is gauged up to 8 so that should fit anyways <3 im excited =3