Description Crema Royal Polished Limestone Tile 18x18 - $2.99 s.f. . Each piece is 2.25 square foot = $6.73 per piece. All Natural Stone products such as granite, marble, etc. are a product of nature and have color, shade, density, and veining variation. When installing, it is recommended to mix tiles from different boxes. All natural stone products should be sealed with a penetrating sealer and maintained with product appropriate cleaners.