This mesmerizing freeform cabochon, nicknamed the Peacock Plume, is an elite example of the iridescent andradite garnets from the legendary San Pedro Mountain locality in Santa Fe County, New Mexico. Weighing in at 22.9 carats and measuring 22.5mm x 12mm x 7mm, it’s an electric display of nature’s precision and chaos.

The stone features a large, sculpted euhedral face polished to reveal a breathtaking lamellar diffraction pattern, glowing with saturated peacock colors—blues, greens, teals, and flashes of purple that ripple across the surface with movement. This optical effect is created by ultra-thin nanolayers of mineral lamellae that interfere with light, resulting in a natural phenomenon akin to diffraction grating or opal fire—but set within a garnet matrix, making it exceedingly rare.

Stones of this quality from San Pedro are exceptionally limited and extremely difficult to cut without disturbing the delicate diffraction layers. This piece retains that full color fidelity and dynamic optical performance in an elegant geometric form, sculpted to frame the phenomenon like a gemstone painting.

A talisman of both mineralogical rarity and surreal optical beauty.