Granite countertops strike a perfect balance between function and style. Besides lending your kitchen an elegant, polished look, they are highly resistant to wear, are inhospitable to bacteria and mildew, and can take a great deal of daily impact. The quality of granite will be the biggest factor in determining the cost of the granite slab. A granite slab is rated on a scaling system based on its quality. The better the quality the higher the price you can expect to pay. The rating of a granite slab is based on the thickness, color, patterns, veining, country of origin, and the ratio of soft to hard material found in the granite.