"Opalescent" refers to a quality of certain materials that exhibit a play of colors, similar to that seen in an opal gemstone. This effect occurs when light interacts with microscopic structures within the material, creating a shimmering, iridescent appearance. Opalescent surfaces can display a range of colors, often shifting between blues, greens, and pinks depending on the angle of light. In addition to gemstones, the term "opalescent" can describe various objects, such as glassware or ceramics that have a similar color-changing effect. Opalescent glass is often used in decorative items and art pieces, enhancing their visual appeal with its unique, luminous qualities.