Deep Blue vs Sapphire Gem

How close are they?

ΔE 13.1, fair: the same colour family, but not a straight swap. Sapphire Gem is a little darker, more muted than Deep Blue.

Can I use Sapphire Gem instead of Deep Blue?

Only where an exact match doesn’t matter, such as a new unit or a highlight. Fair match (ΔE 13). Sapphire Gem is a little darker, more muted than Deep Blue.

Can I use Deep Blue instead of Sapphire Gem?

The same difference applies the other way round: Deep Blue is a little lighter, more saturated.

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.