Stone grey vs Keystone Gray
Where Stone grey belongs to RAL Classic's range, Keystone Gray is a Sherwin-Williams color. Stone grey reads as grey, while Keystone Gray reads as greige-grey — two distinct hue families, not close cousins. They have nearly identical light reflectance values (29 vs 29), so they'll read as similarly Medium in most lighting conditions. The ΔE 4.8 gap is real but not dramatic — close enough to use together, distinct enough to matter as a choice. Below you'll find 1 real-room photo comparison where both colors appear side by side, plus 5 simulated room previews.
Stone grey vs Keystone Gray in Real Spaces
1 real room side by side. Stone grey and Keystone Gray are close enough that the difference can be hard to judge from a chip alone — these photos show how each reads at scale, across different spaces and lighting conditions.
House
Seen across an entire facade, subtle tonal differences become pronounced. What reads as nearly the same on a chip often reads as clearly different at scale. The distinction reads clearly at room scale, making the choice between them concrete.
Color Details
Stone grey vs Keystone Gray Simulated Comparison
5 simulated room previews — drag the slider on each to see Stone grey on one side and Keystone Gray 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 Stone grey comparisons
See how Stone grey stacks up against other well-photographed colors across different brands and tones.
