Chinese Turquoise Bead Necklace Circa. 1950 China Rare natural undyed turquoise bead necklace. Big, chunky beads on double-knotted cord. Turquoise beads tested with refractive index liquid. Beads are approximately 1 inch long and 3/4 inch wide, but vary in size and dimension. All natural. Original silver clasp with Chinese symbol. Marked "silver" on the back of the clasp. 20 1/2 inches long. Fabulous!