Stonemark Granite is exclusive to The Home Depot. Stonemark products are 100% natural granite. All Stonemark Granite treated with Stoneguard sealer is resistant to food and beverage stains. Stonemark Granites treated with Stoneguard are backed by a limited 15 year warranty that covers material integrity defects and food and beverage staining, Pitting, veining and fissures are natural to all real granite, creating a unique character of natural stone. Upgrade your kitchen today with Stonemark. Stonemark Granite slabs are hand-picked for each job. The color and grain can differ from sample slab. This variation is inherent to all granite and is part of the unique character of natural stone. Slab viewing may be available, ask your fabricator for details.