Human Crystal Skull Sculpted from a Natural, Crystal-Clear Diamantina QuartzAAA Crystal Clear Human Crystal Skull, from Diamantina With superb transparency and huge rainbows formed in its interior, this human skull was hand sculpted from a single piece of Diamantina quartz crystal to become this artwork. The Diamantina quartz itself is gorgeous, AAA grade crystal quartz, so clean that it is very difficult to photograph or record. Huge rainbows can be seen all over the skull, a quality that can only be seen in crystals from