I put these shoes on once. I wasn't even walking; just riding in a car as a passenger. When I arrived at my destination, I took them off and left them on the floor. I was surprised to later discover that one of the stones fell out of the shoe and was lying right next to it when I wanted to put these back on.  It didn't get caught in anything; it wasn't pulled out from the shoe by some kind of force. It simply fell out when the shoes weren't even worn. I thought that it was just this one stone, so I saved it and planned on gluing it back on by myself. However, upon my return to my house, I discovered that another stone was missing, and again lying right next to my shoe on the floor. The design is clearly defective, and I'm not going to attempt to even wear them again.