Flagstone vs RAL 820-2
Flagstone is a PPG color while RAL 820-2 comes from RAL Effect. Hue-wise, Flagstone belongs to the grey family and RAL 820-2 to the blue-grey family. With LRVs of 41 and 42, they'll behave almost identically in terms of how much light they reflect back into a room. With a ΔE of 2.6, the difference is subtle — you'd need them side by side to reliably tell them apart. Below you'll find 4 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Flagstone vs RAL 820-2 in Real Spaces
4 real rooms side by side. Flagstone and RAL 820-2 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.
Bedroom
Bedroom walls are often seen under warm artificial light, a context that shifts both colors from how they look on a chip. The two are close enough that the choice comes down to finer qualities — undertone, texture, what the color sits next to.
Kitchen
Kitchen lighting tends to be bright and directional, which sharpens contrast and makes undertone differences more apparent. The two are close enough that the choice comes down to finer qualities — undertone, texture, what the color sits next to.
Bathroom
Bathrooms amplify color — the enclosed space and reflective surfaces make what reads subtle elsewhere feel more present here. The two are close enough that the choice comes down to finer qualities — undertone, texture, what the color sits next to.
Color Details
Flagstone vs RAL 820-2 Simulated Comparison
5 simulated room previews — drag the slider on each to see Flagstone on one side and RAL 820-2 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 Flagstone comparisons
See how Flagstone stacks up against other well-photographed colors across different brands and tones.
At LRV 83 vs 41, White Dove is decisively the brighter choice.
Purbeck Stone reads slightly lighter (LRV 52 vs 41), a gap that shows most in low-lit rooms.
Flagstone reads slightly lighter (LRV 41 vs 30), a gap that shows most in low-lit rooms.
Agreeable Gray reflects far more light (LRV 60 vs 41), opening up a space where Flagstone encloses it.
At LRV 58 vs 41, Accessible Beige is decisively the brighter choice.
At LRV 41 vs 27, Flagstone is decisively the brighter choice.
With LRVs of 43 and 41, the two reflect almost the same amount of light.
At LRV 55 vs 41, Tranquil Dawn is decisively the brighter choice.
Their light reflectance is nearly identical (LRV 44 vs 41), so neither reads brighter in a room.
Pure White reflects far more light (LRV 84 vs 41), opening up a space where Flagstone encloses it.
At LRV 66 vs 41, Balboa Mist is decisively the brighter choice.
At LRV 74 vs 41, Shoji White is decisively the brighter choice.
At LRV 41 vs 12, Flagstone is decisively the brighter choice.
At LRV 41 vs 8, Flagstone is decisively the brighter choice.
At LRV 68 vs 41, Skimming Stone is decisively the brighter choice.
At LRV 41 vs 12, Flagstone is decisively the brighter choice.
A 4-point LRV gap (45 vs 41) makes Saybrook Sage the marginally brighter of the two.
Flagstone reads slightly lighter (LRV 41 vs 31), a gap that shows most in low-lit rooms.