Having a play of lustrous rainbow colors. Synonyms:iridescent, opalescent, opaline, pearlescent."Nacreous (or pearlescent) clouds looking like mother-of-pearl" , "A milky opalescent (or opaline) luster"
... Laurencin produces for us, one that makes the eye avid of more experience and the mind of more of its subtlety. It is an essentially beautiful and satisfying contribution to modern painting, this nacreous... — Adventures in the Arts - Informal Chapters on Painters, Vaudeville, and Poets • Marsden Hartley