A pet rock is a great pet as it does not need to be feed, walked, groomed, showered, nor does it ever disobey, get sick, or die. Many people love pet rocks because they are good for people who don't have enough room for a bigger pet.
Material and group are named the same, as the model.
One multi-submaterial for easy setup.
Rendered in Vray 3.00.03, object at 0.0.0, clean scene.