September 29, 2025

By Isabelle Corvin, CG, Panowicz Jewelers Adularescence and labradorescence are phenomenal lighting effects that add a unique and ethereal charm to certain gemstones. Another term for these effects is the “Schiller effect,” and at its core, adularescence and labradorescence are a scattering of light. Adularescence and labradorescence are most commonly observed in feldspar. The feldspar group is a vast collection of minerals, one of the most common found in Earth’s crust, and includes gemstones like moonstone, labradorite, andesine, amazonite, sunstone, and many more. When feldspar minerals grow, the layers—the building blocks—alternate between different types of feldspar, creating microscopic gaps. When