Girls Snail Ring. Has pretty blue crystals and is adjustable. Silver tone band

Girls Blue Snail adjustable ring. The pictures don’t don’t justice. See photos for approximate measurement. Has blue crystals and silver tone band. It has an empty opening on top of its back. There was never a stone there, please don’t think it fell out. There’s also a area that looks like a cup by that opening there was no stone inside it either.