Navajo Sterling Silver & Turquoise Pierced Post Earrings

These came to me as new old store stock from a Southwestern?Indian shop called "Trails West" that was open in San Diego from the 1940s until the early 1990s. 

These measure 1 1/2" by 1 1/8".  If you looks closely you will se that one is a bit more blue in color. They have quartz inclusions in the stones 

Hallmarked A.M. Sterling on the back. Good condition. some tarnish.