ΔE 10.3, fair: the same colour family, but not a straight swap. Cerulean Blue, Chromium is a little lighter, more saturated than Sapphire Gem.
Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 10). Cerulean Blue, Chromium is a little lighter, more saturated than Sapphire Gem.
The same difference applies the other way round: Sapphire Gem is a little darker, more muted.
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 Sapphire Gem on the colour wheel See Cerulean Blue, Chromium on the colour wheel
All matches: Sapphire Gem equivalents · Cerulean Blue, Chromium equivalents