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Marble has a reputation for being the highest quality stone one can use in the home, but not all marble offers the same resistance to moisture. Since marble features colorful veins, each slab is graded from A to D based on the amount of veining. Marble with an A-grade is most likely to shed water due to a smooth and non-porous surface, while D-grade stone features extensive veins that are likely to let moisture seep through to the shower surround. Only use marble for your shower renovation project if you have the budget to afford high-grade marble tiles and slabs. Use lower grade marble slabs in areas where standing water is rare instead, such as bathroom countertops.