Cos Cob Stonewall vs Ammonite
Cos Cob Stonewall (Benjamin Moore) and Ammonite (Farrow & Ball) come from different manufacturers. Cos Cob Stonewall reads as grey, while Ammonite reads as beige-greige — two distinct hue families, not close cousins. The 43-point LRV gap — 69 for Ammonite vs 26 for Cos Cob Stonewall — means Ammonite will open up a space more effectively. Where Cos Cob Stonewall leans green, Ammonite reads warm — a distinction that shifts noticeably depending on the light source and surrounding finishes. A ΔE of 28.9 puts these firmly in different territory — two distinct design choices rather than close alternatives. Below you'll find 3 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Cos Cob Stonewall vs Ammonite in Real Spaces
3 real rooms side by side. Seeing Cos Cob Stonewall and Ammonite 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
A living room wall sees more varied light than almost any other surface in the house, which makes the choice between these two more nuanced than a chip suggests. Ammonite reflects noticeably more light off the walls, making the space read more open than Cos Cob Stonewall.
Bedroom
Bedrooms are typically lit with warmer, lower light than the rest of the house — a condition that flatters warm tones and deepens cool ones. Ammonite returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
Bathroom
Small bathrooms intensify color. A shade that seems quiet in a larger room can feel immersive when you're surrounded by it on four walls. Ammonite returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
Color Details
Cos Cob Stonewall vs Ammonite Simulated Comparison
5 simulated room previews — drag the slider on each to see Cos Cob Stonewall on one side and Ammonite 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 Cos Cob Stonewall comparisons
See how Cos Cob Stonewall stacks up against other well-photographed colors across different brands and tones.
