"Do you know what a pearl is and what an opal is? My soul when you came sauntering to me first through those sweet summer evenings was beautiful but with the pale passionless beauty of a pearl. Your love has passed through me and now I feel my mind something like an opal, that is, full of strange uncertain hues and colours, of warm lights and quick shadows and of broken music."

Source: James Joyce (2016). “The Complete Works of James Joyce: Novels, Short Stories, Plays, Poetry, Essays & Letters: Ulysses, A Portrait of the Artist as a Young Man, Finnegan’s Wake, Dubliners, The Cat and the Devil, Exiles, Chamber Music, Pomes Penyeach, Stephen Hero, Giacomo Joyce, Critical Writings & more”, p.3707, e-artnow