StoneX USA – Premium Granite, Marble, Quartz & Porcelain Surfaces for Every Space StoneX USA is a premier supplier of high-quality granite, marble, quartzite, porcelain, and quartz surfaces, proudly offering over 450 unique color patterns for kitchens, bathrooms, fireplaces, outdoor kitchens, and LVT vinyl floor tiles. Whether you're renovating a home or designing a commercial space, our extensive inventory provides the perfect surface to bring your vision to life.