Navajo Ring .925 Silver Kingman Turquoise Native American Artist C.198 Lot Navajo Kingman Turquoise Ring Kingman Ring by Navajo 6.5 Lot Navajo Kingman Turquoise Ring Lot Navajo Kingman Turquoise Ring. Beautiful sterling silver, hand stamped ring is set with Kingman Turquoise. Ring size: 6. 5 Width: 1. 50" Stone Size: 0. 94" x 0. 63" Material: Sterling Silver (Silver925) Weight: 0. 54Oz 15. 31Grams Tribe: (Navajo) Stone: Kingman Turquoise 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 1,000 years ago. Kingman Turquoise is known for its beautiful sky blue color and produces many variations of blue Turquoise.