Also described as: blue-gray eyes, steel blue eyes, grey-blue eyes
A pale iris that reads as neither clearly blue nor clearly grey, and which many people describe as shifting between the two. This is one of the most commonly self-reported descriptions and one of the least commonly recorded categories in formal classification — most systems force a choice between blue and grey, so eyes in this range are assigned to whichever the observer judges dominant on the day.
'colour-changing eyes'
cooler, greyer end
An illustrative approximation only — a flat swatch cannot reproduce the depth and scattering of a real iris.
bluer end
An illustrative approximation only — a flat swatch cannot reproduce the depth and scattering of a real iris.
Can lean towards a cool steel, a soft slate, or a clearer blue, and the balance frequently appears to change with surroundings.
How much the iris reads blue versus grey, and whether a faint green or amber ring is visible near the pupil.
Frequently reads bluer under bright daylight and greyer under overcast or indoor light, and is strongly influenced by the colour of nearby clothing — a blue shirt can make the same eyes read distinctly blue.
Particularly unreliable in photographs. Because the category sits between two others, an automatic white balance decision alone can be enough to move the recorded colour from one side of the boundary to the other.
Blue-grey is a widely used everyday description, but it is not a category population studies generally count separately from blue or grey, so no reliable separate prevalence figure exists.
There is no established separate prevalence figure for blue-grey eyes, because almost no study treats it as its own category. Any number presented as one would be an artefact of how a particular study drew its boundaries, not a measurement of a distinct group. No figure is stated here for that reason.
Styling ideas below are optional and editorial — never rules, and never a claim that one colour choice is objectively correct for anyone.
Confidence: low. Geographic scope: Not tracked as a separate category in the available literature, so no geographic distribution can be stated for it specifically.