Granite is a natural material and typically mined in blocks no more than 10 feet long, so you may have a seam. The visibility of seams depends on the granularity, color and pattern of the granite. A small uniform grain will not be as apparent as a larger varied grain. A seam in a dark color will be less apparent than a seam in a light color. A dramatic pattern with swaths of color will show more seams than a uniform pattern.