Two Pairs of Handmade Southwest Native American Sterling Silver Earrings

Presented is a fine set of Native American sterling silver earrings. Both pairs have a triangular design. The first pair is composed of a sterling silver triangle topped with a black and red triangle that looks like stone but appears to be made from plastic, but I am not sure what the material is. The second pair is completely made of sterling silver. It is composed of a smooth finish triangle topped with a trapezoid with a pebbled finish. They were made by in the Southwest USA by a Navajo, Zuni, or Hopi craftsman.  All the earrings are stamped sterling. One of the earrings in the first pair has an F maker’s mark. The second pair of earrings has an A maker’s  mark.  The earrings are in great condition. There are no dents, no breaks, and no repairs.  The first pair of earrings measure 1 ½ inches by 2 1/8 inches. The second pair of earrings measures 1 ½ inches by 1 5/8 inches.  The total weight is 36 grams or 1.3 ounces.