ΔE 9.0, close: similar, with a visible difference side by side. Primary Blue is a little lighter, cooler than Arctic Gem.
Usually, if you are not matching paint already on the model. Close match (ΔE 9). Primary Blue is a little lighter, cooler than Arctic Gem.
The same difference applies the other way round: Arctic Gem is a little darker, warmer.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See Arctic Gem on the colour wheel See Primary Blue on the colour wheel
All matches: Arctic Gem equivalents · Primary Blue equivalents