This is 950 silver and I have been wearing it for 6 weeks or so. Excellent craftsmanship and very pretty. I shower and sleep as well with this on. No tarnish. I do wipe it with soft cotton cloth few times a week. Will highly recommend this.
I purchased this for myself to replace one that had broken, I love the starfish charm......it's just the right size. I love that it is adjustable too. Quality is excellent!