Black Sapphire vs Just Walnut
Black Sapphire (Behr) and Just Walnut (Dulux) come from different manufacturers. Hue-wise, Black Sapphire belongs to the blue-grey family and Just Walnut to the beige-greige family. The 65-point LRV gap — 72 for Just Walnut vs 7 for Black Sapphire — means Just Walnut will open up a space more effectively. Where Black Sapphire leans blue, Just Walnut reads warm — a distinction that shifts noticeably depending on the light source and surrounding finishes. A ΔE of 59.2 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.
Black Sapphire vs Just Walnut in Real Spaces
1 real room side by side. Seeing Black Sapphire and Just Walnut in actual rooms makes the difference concrete; browse the spaces below to get a feel for how each color lives on a wall.
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. Just Walnut returns significantly more light to the room — in a smaller or darker space, that difference in perceived brightness is hard to miss.
Color Details
Black Sapphire vs Just Walnut Simulated Comparison
5 simulated room previews — drag the slider on each to see Black Sapphire on one side and Just Walnut 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 Black Sapphire comparisons
See how Black Sapphire stacks up against other well-photographed colors across different brands and tones.
