Priday Ranch isn't a generic material name — it's a specific place. The original Priday Ranch sits outside Madras, Oregon, and has been producing collector-grade agate since a rancher named Leslie Priday first found it on his land back in the 1920s.
What comes out of the ground there are thundereggs — round, unassuming nodules that look like plain rock on the outside but split open to reveal agate cores threaded with delicate, feather-like "plume" inclusions in warm browns, creams, and grays.
That plume pattern is the whole reason this material has a devoted following among agate collectors decades after it was first dug.
Each cabochon in this lot carries that same lineage — organic, wavy plume and moss-like patterns set against a translucent-to-opaque agate base, no two stones showing quite the same internal "scene."
Because thunderegg nodules vary so much in what they contain, cutting Priday Ranch material into cabochons has always been part science, part gamble; the pattern only fully reveals itself once the stone is sliced and polished.
That unpredictability is exactly what agate collectors and designers chase this material for.