Adjustable Kingman Turquoise Chips Bracelet in Copper. The Kingman Turquoise Mine is one of the oldest and highest producing Turquoise Mines in America. It was originally discovered by prehistoric Indians well over 1000 years ago. The Kingman Turquoise mine also produces green Turquoise from the Turquoise Mountain side of the mine. Approximately 7 1/2" long. Adjustable from 6 1/2" to 7 1/2". This bracelet has been antiqued, polished and sealed. Sealed with Protectaclear. ProtectaClear is a clear, protective coating that is tough enough to protect jewelry and is safe for wear against skin. ProtectaClear is practically invisible once applied and will seal and protect jewelry from tarnish, oxidation, and corrosion.