Probably Zuni. Natural mined turquoise in a great silver medallion shape. 1930s-40s.
Los Castillo Hand-hammered Silver, Lapis and Malachite Shell Dish
Los Castillo Silverplate and Inlaid Lapis and Malachite Covered Dish
Monumental Los Castillo Silver/Copper/Malachite/Lapis/Turquoise Pedestal Dish
Los Castillo Low Vase in Silver, Copper, Malachite and Lapis Aztec Motif