Be sure to watch the video to see the unique sheen and flash of this special stone. It is said that wearing Labradorite stimulates mental acuity and helps the wearer achieve spiritual enlightenment. When I purchased these I was told it is .925 Sterling Silver, however it is not marked. I would say at the very least it is sterling plated. It shows NO signs of tarnish or damage of any kind. I have only worn these a few times and would love to hand them off to someone who has more opportunity to wear them.