Buff Gray Castle Rock is known for its unique shades of grays and buffs. It can range from light to dark grays, blues, buffs, and creams that often vary within one stone. Split to rough squares and rectangles, it ranges in heights from 4″ up to 12″ and lengths from 6″ up to 42″ for full veneer and 6″ to 24″ for thin stone veneer,