Gale Self designer hallmarked sterling silver turquoise bead choker necklace

From my personal collection, vintage choker designed and hadmade by Gale Self. Hallmarked with name, "sterling" and "choctaw." Turquoise and sterling horseshoe-shaped pendant wired to two strands of turquoise beads . Horseshoe is 1 1/4 x 1 1/8". Total necklace length is 16" long. Weight is 1.27 ounces/35 grams. I do not know what kind of turquoise it is. J60 native american rodeo indian navajo western horse fair festival gypsy boho bohemian