This was made for me by Yamasan of Ueno, who is famous as Hoshi Hitomi's father. I've been wearing it for about six months and my luck has been great, so I'd like to pass it on to someone else. The wire was just replaced recently. You can have it replaced in the future if you take it to the store. Inner diameter: approximately 17cm From the center: Aurora Quartz Rutile Quartz Sea Blue Chalcedony Sapphire Charoite Larimar