A fine cluster of sharp, transparent smoky quartz crystals with excellent color from Graubunden, Switzerland. The smoky quartz crystals project in different directions, giving a striking appearance. One of the large crystals has this incredible, interior, rainbow prism effect, which is plainly visible in the photos. The terminations of the two largest smoky quartzes are in very good shape: one is pristine; and the other has only very trivial edge-wear. Ex. Tribbey and Tarnowski Collections.