Hazel eyes are a unique eye color that is a combination of brown, green, and gold, with blue or amber sometimes making an appearance as well. The appearance of hazel eyes can vary widely from person to person, making it difficult to define the color. Some hazel eyes look more green at a distance, while others might look more brown. Hazel eyes have a different hue around the pupil than on the eyes outer rim, which can give them a "sunburst" effect.

The color of hazel eyes is determined by the distribution of melanin in different parts of the iris. Eyes with less light-absorbing melanin appear green or hazel, and eyes with low concentrations of melanin appear blue. The distribution of melanin can vary in different parts of the iris, causing hazel eyes to appear light brown near the pupil and more green in the periphery of the iris.

Hazel eyes are a rare color, estimated to be in only 5 percent of the global population, with about 18 percent of people in the United States having hazel-colored eyes. Hazel eyes are often described as unique because they feature a combination of colors, and they are often divided into two groups: hazel green or hazel brown.

In terms of perception, hazel eyes are associated with spontaneity, enjoyment, and adventure, and they are said to possess intelligence and wit. Hazel eyes have a reputation for being mysterious and alluring, which may explain why they are considered so attractive.