Gray has no single source
Most colors in a tile catalog trace back to one material. Beige is travertine. White is marble. Gray is not: it is slate, it is Bardiglio marble, it is quartzite, it is a concrete-effect print, and it is a glaze that was mixed to be gray.
Porcelain leads here, then glass, then marble, ceramic, travertine and quartzite. That spread is unusual and it follows from the processes: no other color arrives from so many unrelated ones at once.
The undertone decides the match
Every gray leans somewhere, and the lean has a cause. Slate goes green where chlorite is present in it and red-purple where hematite is. Bardiglio marble leans blue. Real cured concrete is a cool neutral gray, so where a concrete-effect tile reads warm that warmth was put there by the printer, and plenty of them do read warm, because a warm neutral suits more rooms than a cold one. A glazed ceramic gray leans wherever the maker mixed it.
That is why two grays chosen from photographs frequently look wrong together in a room: they were never the same gray, they were two different undertones both labelled gray. It is also why the undertone matters more than the depth when a floor and a wall have to agree.
The gray marbles
Bardiglio is the name to know, a gray marble with fine white veining and a blue cast to it. Silver is a series name that covers a group of pale grays across several materials, so it appears on stone and porcelain listings alike. Quartzite appears in smaller numbers and behaves differently from marble: it is a quartz-bearing stone and does not react to a household acid the way a carbonate does.
The marble tile range has the stones in their other colors, and marble floor tile the floor formats specifically.
Slate, split face and ledger panel
A real part of this range is split face, which is stone broken along its natural cleavage where a tile is sawn flat, and most of it is ledger panel: strips of that broken stone bonded into a unit for cladding a wall.
Slate is where gray gets its most saturated version. A cleft face carries color in layers and shifts as the light moves across it, which is a property of the split rather than of the color. The slate look tile range answers the same appearance in porcelain, with a flat face and a repeat, and it is the choice for a floor that takes heavy traffic.
Concrete effect
Concrete effect is one of the largest looks here and it is gray without a quarry: a print of a poured surface, which is a manufactured material copying another manufactured material. It is also the look that made gray the default interior color through the 2010s, because a concrete floor reads as a background where a stone floor reads as a feature.
Travertine, marble, limestone and slate effects sit alongside it, which means this page holds both a real slate and a print of one. Those are different products and the difference shows at close range and disappears across a room.
Glass at the gray end
Glass is the second largest material here, which surprises people who think of glass as the colored option. A gray glass mosaic is doing something specific: it carries depth without carrying color, so a wall gets the lit quality of glass and stays neutral.
That is why gray glass ends up on backsplashes and bath surrounds in rooms where a blue or green glass would commit too hard. The glass tile range covers its other colors.
Formats from mosaic to paver
12x12 and 12x24 lead almost level with each other, then 24x24 and 24x48. Below them sit the mosaic sheets and the 2x2 pieces; above them, a real group of pavers.
The thickness list is where that range shows: 3/8 inch and 9 mm for interior tile, and then 1 1/4 inch and 20 mm groups that are outdoor pavers. A 20 mm gray porcelain and a 9 mm gray porcelain can share a face and answer completely different jobs.
Gray outdoors
Pavers, pool coping and the Frontier20 series together make up a substantial part of this page, and gray is the natural outdoor color for a reason that has nothing to do with taste: a gray surface shows less of what weather deposits on it than either a pale or a dark one.
The outdoor porcelain and stone pavers ranges hold the exterior formats across colors.
What the finish does to a gray
Matte covers a plurality here, with glossy, polished, honed and tumbled behind it. On gray specifically the finish does more than usual, because gray has no figure of its own to look at on most of these products: strip out the veining and the surface is what is left.
A polished gray reads cooler and harder; the same gray honed reads softer and warmer. That shift is large enough that people who dislike gray often dislike polished gray.
