Here is a pair of classic vintage Zuni multistone inlaid sterling silver Sunface earrings. Earrings like these can be seen in every Native American Indian jewelry history book.
The earrings measure 3/4 inch wide and weigh 3.3 grams each. I don't see a hallmark. Excellent condition. circa 1970-80's.
As is the case more often that not with the earlier Native American jewelry, this piece is not marked for silver content or maker. However, I guarantee that it is coin silver (.900/90%) or sterling silver (.925/92.5%). When I test jewelry for silver content, I never drop the testing solution directly on the piece of jewelry since the acid could damage the piece. Rather I rub the piece against a testing stone and drop the acid on the testing stone.