Stone tiles are a product of nature and therefore, no two pieces are ever the same. For this reason, all natural stone tiles are subject to variation in calibration, colour, grain structure and veining, as well as pitting, fissures and cracks. Natural fossils, minerals and oxides may remain in stone tiles and therefore extra allowance for wastage should be made when using natural stone tiles. Variation in shade and veining can be minimised visually on site with professional blending by an experienced natural stone tiler. A tiler should never take the tiles straight from the crate and install in the order they were removed. Any tiles with dramatic variation within each tile should be used for cutting. If you do not want variation in colour and veining, and you prefer a uniform and consistent look, perhaps consider porcelain tiles. Porcelain tiles are machine manufactured, where the design constrains colour shifts and any veining is printed to a standard.