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.
This sterling mounting is 3/4" at the widest part, slightly smaller than expected. The black obsidian stone is 1/2", also smaller than expected, but still lovely to wear. It is on a 17" silver necklace. It is a quality piece.