I was absolutely thrilled upon receiving this in the mail.
After having it blessed our youngest wore it on a school sponsored trip to Europe, ten days into the trip he was wearing a loose fitting sleeveless shirt, my wife saw a dark ring around his neck where the chain rested on his neck.
She made him remove the chain and scrub his neck as hard as he possibly could.  The mark didn't clean up until after being home for a few days.
The description says that it is sterling silver, maybe spayed with silver paint