Here is a pair of classic vintage Zuni turquoise inlaid sterling silver Rainbow Man earrings. Earrings like these can be seen in every Native American Indian jewelry history book. The earrings are flush set inlaid with natural turquoise.
The Rainbow men measure a bit over 3/4 long. I don't see a hallmark. Excellent condition. circa 1960'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.