Open English Wordnet
Adjectives
(s)changeable, chatoyant, iridescent, shotvarying in color when seen in different lights or from different angles“changeable taffeta”, “chatoyant (or shot) silk”, “a dragonfly hovered, vibrating and iridescent”
(s)iridescent, nacreous, opalescent, opaline, pearlescenthaving a play of lustrous rainbow colors“an iridescent oil slick”, “nacreous (or pearlescent) clouds looking like mother-of-pearl”, “a milky opalescent (or opaline) luster”