Being natural stone, we cannot warranty your granite/marble/quartzite countertops. However, we do warranty our workmanship. Ancient Art Stone will always stand behind the projects that we do, so if you have a problem please do not hesitate to give us a call and we will be more than happy to assist you and fix the problem as best we can. If you are interested in man-made quartz products, we have several quartz companies that we work with, and each company has their own limited lifetime warranty.