For as many years as I've worked in the eye profession, I've heard people say, "there's no such thing as black eyes." That's false, untrue and ridiculous. Of course there are black eyes. And black eye color is the majority in the world. Those of the Sub-saharan African and Asian races (and their shoot-off races that have NO European admixture) possess black eyes.
Black eyes are just that - black. They show no coloring other than pure black. There is no visible brown, gold, red, blue, green, yellow or grey. They do not change according to lighting as they are solid in color. There are no highlights to that coloring. To look into a dark brown eye, you could see visible brown coloring. To look into a dark brown eye, you could see highlights of other colors such as some gold or red specks or a "cherry" tone to the dark brown. To look into a black eye, you see none of that.
Black eyes, although common, are quite pretty. We have sold several pairs of black contacts over the last few months. There's an interest in this coloring. However, many people with black eyes do approach us for all shades of brown and hazel contact lenses.
The only way a white European could have dark eyes is if they are brown, not black. Black eye coloring is preserved for those of African and Asian races only.