This rough Cantera opal is a truly exceptional natural specimen, displaying soft pastel flashes that are extraordinary. Unlike the more common bold reds and greens, this piece reveals delicate washes of lavender, mint, peach, and powdery blues—colors that only appear under very specific formation conditions and are seldom seen in rough form. Still partially encased in its native rhyolite matrix, this opal offers a raw, untouched look that collectors and cutters prize. The pastel play-of-color ro

Pumice