One of a kind sterling silver Kingman turquoise ring with etched flower design on sides and etched marks. Always available to size upon request for a $10-15 charge. 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.