• Rhodium Over Brass • Size: 0.69"L x 0.38"W on post • Material: emerald cats eye Material Highlight: Cats Eye Glass Cat's Eye Glass contains optical fibers that allow the stone to change hues as it captures light. The term cat's eye describes the process conducted during the creation of the stone. Before the glass cools, thin transparent fibers are strung through the glass to create a reflective look.