Chunky Vintage Mid Century Mexican Azteca design clip on earrings that have a Brutalist vibe. IThe drops have a design that incorporates elements of the Aztec calendar.They are 1 3/4" long by 1" wide. Each is set with a rough faceted natural amethyst. One stone has a deep purple color and the other is lighter.. Have a nice gunmetal patina from age. Weight together: 18.6 grams. Hallmarked on the back. 

This is part of a set, but since the style is Uni-sex I decided to split the set up. Here are all three pieces together.