Jean Mahie Jade and 22K Gold Bead Necklace. The necklace features natural jadeite jade beads separated by 22k gold rings and large gold spheres. The jade beads are graduated from 8mm to 12mm, the gold spheres graduate from 15.40mm to 21.50mm. Length of the necklace is 20.5 inches. Stamped JM 22K.