One particularly fascinating fact about white opals is that they can exhibit a phenomenon called “contra luz” color. This effect is different from the typical play-of-color seen in most opals. “Contra luz” means “against the light” in Spanish, and in these opals, the spectacular color display is only visible when light passes through the gemstone, rather than being reflected off its surface. This can result in vivid flashes of rainbow colors that appear to float within the opal itself when it is held up to a light source, providing a stunning visual experience that is highly prized by collectors and gem enthusiasts.
