These earrings are probably coin silver (about 800 fine) since they are not marked, and are somewhat older. There is some etching around the larger loop, as well as on the samll quetzal birds. These earrings are of lighter gauge silver than some of the others. These earrings are the ones in the upper right of the photo below.
Please be aware that these earrings are handmade. The ear wire is somewhat larger than for commercially produced examples, and there is a handmade closure hook at the end of the ear wire. For these reasons, a somewhat larger ear pierce is necessary.