The American Indian Hallmark Guide identified these earring as having been made by Zuni artists Wilson & Carolyn Niiha. They are extremely well done and the artist not only inlaid the pieces together but also inlaid 3 very thin onyx lines into the mother of pearl.
The stones used are turquoise, onyx or maybe jet (the small pieces of black are hard to differentiate) coral and mother of pearl.
Signed WCN for Wilson & Carolyn Niiha
Size: 2" long by 3/4" across the bottom
Weight: 8.5 grams