This 15.8cm x 10.5cm x 0.4cm iris agate slice is a masterpiece of nature—one of the finest American iris agates ever discovered. Cut from a legendary limb cast, the rest of the specimen currently resides in the Smithsonian Institution’s mineralogical collection, cementing its place among the most significant agates in existence.

The diffraction of light across this piece is absolutely unreal, producing an ethereal rainbow play of color that shifts dynamically with the angle of view. The fine banding and perfect translucency create an optical effect that rivals the most stunning examples of the phenomenon.

Sourced near Prineville, Oregon, this slice represents the pinnacle of iris agates, a true collector’s specimen with both historical and mineralogical significance. Whether for a museum-level collection or a statement display, this is a once-in-a-lifetime acquisition.