Special import of "YOOPERLITES," a brand new type of power stone discovered in 2017 on the shores of Lake Superior in Michigan, USA! The biggest attraction is the mysterious yellow glow when exposed to UV light (black light). This luminescence is a very rare natural phenomenon caused by the high content of "fluorescent sodalite." Yooperlite was officially recognized as a new mineral in 2018 and named by its discoverer, Erik Rintamaki. Round bead size: 14mm Inner circumference: approx. 16cm * As these are natural stones, there may be small chips, dents, irregularities, and cracks. * There are individual differences in the color of natural stone products. We try to photograph them to show their natural colors as much as possible, but the colors displayed may differ depending on your display environment. Please understand. * Sizes are approximate. There may be slight variations. Please note that due to the nature of the stone, it will not glow easily in everyday sunlight. Thank you for your understanding.