The primary reason that Quartz countertops cost more than Granite countertops is that “Granite slabs” are formed and “Quartz slabs” are made. The raw materials to make Quartz are expensive and so is the process. Typically this questions leads into the next question, “Why are some of the colors of Granite more expensive than Quartz?” This mainly has to do with the color and the quarry it comes from. Some colors are deemed more expensive due to their look. Some of them it has to do with where and how many quarries there are to polish the slabs.