Early Navajo Tufa Cast Naja Pendant with Natural Turquoise on Silver Beads

Early Navajo tufa stone cast naja pendant. It is set with natural turquoise has has spider webbing and two colors of turquoise. It has a clip style bail on the back. It is on a double strand of small nickel silver beads. (Not sterling) The Naja is solid sterling. It measures 2 1/2" tall by 2 1/8" wide. Necklace is 22" long. Weight is 66 grams.