Vintage Spratling of Mexico necklace

Such a cool piece I found while traveling the West Coast. The color is beautiful and the design is gorgeous! The chain is 16 inches and it’s a screw closure. You can see that it was stamped on the back. I don’t think it’s real turquoise in the center stone but I’m not sure. I did not glue the centerpiece in, I bought it that way. I see the same necklace but with amethyst for $1900 on eBay . Statement piece!