This is a fascinating vintage Navajo Native American Jewelry heavy silver mens ring. This large ring contains a huge Royston turquoise stone from the old Royston turquoise mine. Surrounding the stone is a thick silver rope. The center stone measures around 20mmx15mm The ring face measures around 1-1/4″ x1″inch The ring size is around 11. Mid century no marks but tested as. Sturdy 19.5grams great addition to your collection Situated near Tonopah, Nevada, the Royston turquoise mine is an exceptional source of Turquoise. This family-owned mining claim, operated by the Otteson family, yields an exquisite array of turquoise colors, spanning from deep green to vibrant blue. A unique characteristic of many Royston turquoise stones is the presence of both green and blue shades within the same cut, creating a mesmerizing visual effect. The host rock or matrix found in Royston turquoise often displays deep brown or golden brown tones, adding to the overall appeal of these stunning stones. Under the careful stewardship of the Otteson family, the Royston Mine continues to produce high-quality, natural turquoise that artists love to work with and enthusiasts love to collect.