Having a changeable, varying luster, or color, like that of a changeable silk, or oa a cat's eye in the dark.

A hard stone, as the cat's-eye, which presents on a polished surface, and in the interior, an undulating or wary light.

varying in color when seen in different lights or from different angles; "changeable taffeta"; "chatoyant (or shot) silk"; "a dragonfly hovered, vibrating and iridescent"