The "Spectral Shield" 

Nicknamed “The Spectral Shield,” this 7.4 ct polished rainbow andradite garnet is one of the most exceptional specimens ever recovered from San Pedro Mountain. Measuring 16mm x 11mm x 5mm, its large, flat faces flash with intense, shifting spectral colors, making full use of the rare lamellar diffraction that defines this phenomenon.

The play of light across this piece is vivid and electrifying—bands of rainbow color ripple and shimmer with every tilt, giving the stone a dynamic, almost ethereal presence. The precision polish and broad face geometry elevate it even further, creating a mirror-like effect that amplifies the visual impact.

“The Spectral Shield” is a masterwork of natural optical phenomena, and a benchmark piece for this highly sought-after locality. Whether set in visionary jewelry or held in a curated collection, it’s a gem that tells a story in light.