Colonnade Gray vs Sea Mariner
Colonnade Gray and Sea Mariner come from the same Sherwin-Williams collection. Hue-wise, Colonnade Gray belongs to the greige-grey family and Sea Mariner to the blue-grey family. The 46-point LRV gap — 53 for Colonnade Gray vs 7 for Sea Mariner — means Colonnade Gray will open up a space more effectively. Where Colonnade Gray leans warm, Sea Mariner reads cool — a distinction that shifts noticeably depending on the light source and surrounding finishes. A ΔE of 48.4 puts these firmly in different territory — two distinct design choices rather than close alternatives. Below you'll find 1 real-room photo comparison where both colors appear side by side, plus 5 simulated room previews.
Colonnade Gray vs Sea Mariner in Real Spaces
1 real room side by side. Seeing Colonnade Gray and Sea Mariner in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
Kitchen Cabinets
Cabinet color is always seen in context — against countertops, backsplash, and hardware — which amplifies undertone differences that might disappear on a plain wall. Colonnade Gray returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
Color Details
Colonnade Gray vs Sea Mariner Simulated Comparison
5 simulated room previews — drag the slider on each to see Colonnade Gray on one side and Sea Mariner 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.