Jade bead necklace is good for health since jade can improve chi circulation in the body. In addition jade necklace can help people calm down and relax. The jade bead necklace is made of Chinese jade. The whole length of the jade necklace is approx. this la bead necklace is approx. 18 in length. Each of the jade beads is approx. 7/16 in diameter. Warning: This item can expose you to chemicals which are known to the State of California to cause cancer birth defects or other reproductive harm. For more information go to www.p65warnings.ca.gov