Granite comes in a wide range of grades that indicate its quality. At the lowest grade, the slab is only 3/8 inches thick, has a plain pattern, and comes in basic colors, like white, green, and gray. Mid-grade stone is a bit thicker at 3/4 inches, and boasts brighter colors and interesting patterns. The highest grades are much thicker and have vivid tones and complex patterns. Rare colors are most common at the higher grades, though it’ is possible to find veneer and tile in those tones.