This is an incredible Navajo 1960s Sterling silver ring. The tall Nevada blue turquoise stone is set on silver serrated tooth saw bezel design and then nestled among two silver leaves! The center stone measures around 16mmx9mm The ring face measures around 1? X12mm The ring size is around 12Sterling silver. Sturdy 20.3 grams Nevada Blue. The Nevada Blue mine has a long history, first mined in 1901 under the name Pinto/Watts. The Nevada Blue material was mined by the Hammon family from the late 1960’s up into the early 1980’s, and for the past 40 years had been part of the collection of Herb and Dottie Lindner. Today, due to extremely difficult access, the Nevada Blue Mine is no longer producing. Herb was the major source for Nevada Blue cabochons when he was actively cutting, and you’ll see his stone in classic pieces by Charles Loloma and Lee Yazzie, among other great native jewelry artists of the time. The mine is currently owned and operated by Helen and Richard Shull.