Vintage Southwestern styled sterling silver screw back earrings. Each earring is set with two chrysocolla stones that are mostly green, but one has a vein of turquoise running through the middle like a flash of lightning. The other drop stone has a duller polish and not as much flashy color. 

They are marked 925, so likely are not Native American. Measure 1 1/2" long. Weight: 12.2 grams.