Blue Onyx is a rare and visually arresting variety of chalcedony, celebrated for its vibrant sky-blue to deep navy palette. Often characterized by dramatic, flame-like bands of white, orange, and gold, this translucent stone offers a sense of fluid movement. Primarily sourced from high-quality deposits in Argentina and Mexico, it is a favorite for luxury interior applications, including spectacular backlit panels that showcase its internal crystalline artistry. Geologically, its serene blue hue is a result of the Tyndall effect, where light scatters off microscopic particles. Historically, while jet-black is the common association for onyx, these blue specimens have been prized since antiquity for their calming elegance and use in intricate cameos.