Which gem is known for its ability to exhibit play-of-color?

Moonstone is renowned for its ability to exhibit play-of-color, a phenomenon known as adularescence. This optical effect occurs when light scatters off the internal layers of the gemstone, leading to a shimmering glow that can change and shift as the angle of view changes. The soft, ethereal light that appears to float beneath the surface of moonstone enhances its aesthetic appeal and distinguishes it from other gemstones.

In contrast, diamonds exhibit brilliance and scintillation but do not display the play-of-color characteristic typical of moonstone. Rubies are valued for their rich red color and fluorescence but lack the unique optical effects associated with play-of-color. Pearls, while beautiful and valued for their luster and color, do not have the same play-of-color effect that defines moonstone, making it the clear standout in this category.