A guide to the gem growth locations on members of the Petralumen species. The darkest purple signifies the most common, the next darkest signifies less common, light purple signifies rare, and the near-white purple signifies places where the gems will never grow. The most common places are the shoulders and hips, and places that never grow gems are the inner parts of the arms, legs, and tail, most places on the head, hands and feet, the chest, the butt, and the crotch.