Acier vs Warm Stone
Both from Sherwin-Williams's palette. Hue-wise, Acier belongs to the grey family and Warm Stone to the greige-grey family. Acier (LRV 32) reflects noticeably more light than Warm Stone (LRV 20), a difference of 12 points that becomes especially apparent in rooms with limited natural light. Acier runs neutral while Warm Stone is decidedly warm, which means they'll respond very differently to warm vs cool light sources. With a ΔE of 12.4, the contrast is hard to miss. These aren't variations on a theme — they're two different answers to the same question. Below you'll find 2 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Acier vs Warm Stone in Real Spaces
2 real rooms side by side. Seeing Acier and Warm Stone in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
Living Room
In a living room, color works across both daylight and evening light — the same wall can read very differently at noon and at 8pm. The LRV gap is large enough that Acier will make the room feel meaningfully brighter than Warm Stone would.
Kitchen Cabinets
Kitchen cabinets are constantly compared against adjacent materials, which means subtle differences between these two become much more visible. Acier reflects noticeably more light off the walls, making the space read more open than Warm Stone.
Color Details
Acier vs Warm Stone Simulated Comparison
5 simulated room previews — drag the slider on each to see Acier on one side and Warm Stone on the other.
Digital color is approximate. These simulations are generated from the manufacturer's hex values and overlaid on grayscale room photos — your screen's calibration, brightness, and viewing angle all affect how they render. Before committing to either color, test physical samples in your own space under the light you actually live with.
More Acier comparisons
See how Acier stacks up against other well-photographed colors across different brands and tones.
