I went to the Blue Lagoon last year and had read the warnings they email you to take off jewelry and like you was concerned for my WG love bracelet to lose its shine, darken or whatever. I packed its cleaning set to brush it right away in the changing room if necessary, but it was perfectly o.k. I even thought it looked more clear and shiny than before. So keep it on and don't worry and enjoy the experience! I hope to return soon.