This is a bolo chain bracelet 18k gold plated completely adjustable from 6 to 9 inches with an Evil Eye mother of pearl and 0.75 inches cubic zirconia charm eye shape connector.
It has a 18k gold plated bead that you slide into position up and down the chain to allow the perfect fit.
About Evil Eye: According to the kabbalah, most of everyday misfortunes happen because of the evil eye. The human eye has the capability to transmit both positive and negative energy. The evil eye is that a person can harm you, your children, your livestock, or your fruit tress, by "looking at them" with envy and praising them.