Sapphire blue vs Functional Gray
Where Sapphire blue belongs to RAL Classic's range, Functional Gray is a Sherwin-Williams color. Hue-wise, Sapphire blue belongs to the blue family and Functional Gray to the greige-grey family. Functional Gray (LRV 37) reflects noticeably more light than Sapphire blue (LRV 6), a difference of 31 points that becomes especially apparent in rooms with limited natural light. With a ΔE of 51.6, 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 5 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Sapphire blue vs Functional Gray in Real Spaces
5 real rooms side by side. Seeing Sapphire blue and Functional Gray 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 Functional Gray will make the room feel meaningfully brighter than Sapphire blue would.
Bedroom
The context that matters most in a bedroom is how a color reads under a bedside lamp at night, not under noon daylight. Functional Gray reflects noticeably more light off the walls, making the space read more open than Sapphire blue.
Bathroom
Bathrooms are one of the few spaces where you're genuinely enclosed by the paint color, which makes the choice between these two more consequential. Functional Gray reflects noticeably more light off the walls, making the space read more open than Sapphire blue.
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. Functional Gray reflects noticeably more light off the walls, making the space read more open than Sapphire blue.
Kitchen Cabinets
Kitchen cabinets are constantly compared against adjacent materials, which means subtle differences between these two become much more visible. Functional Gray reflects noticeably more light off the walls, making the space read more open than Sapphire blue.
Color Details
Sapphire blue vs Functional Gray Simulated Comparison
5 simulated room previews — drag the slider on each to see Sapphire blue on one side and Functional 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 Sapphire blue comparisons
See how Sapphire blue stacks up against other well-photographed colors across different brands and tones.
