Cantera Opal Petrified Palm Root Beauty.. Cantera Opal has iridescent hints of green, orange and red, the petrified palm root has been cut into a crescent moon shape. The pendants holding the gemstones are all sterling silver. Fancy gallery wire and stamped shots were designed to bring texture and depth. The chain  links are of sterling silver,  hand forged and shaped into circular links. The links are secured with 20g wire torched into balls in the ends. Choker is adjustable from 16”-18”.