The turquoise is set in beautiful, hand stamped sterling silver with scalloped edges. The tops of the earrings resemble small conchos for that classic western look. Earrings measure approximately 2 1/2 inches in length. 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. Kingman Turquoise is known for its beautiful sky blue color and produces many variations of blue Turquoise. Kingman turquoise earrings.