* Brown: The most common eye color, brown eyes have a high concentration of melanin in the iris.
* Blue: Blue eyes have the least amount of melanin. The blue color is not actually due to a blue pigment, but rather to the way light scatters in the iris (a phenomenon called Rayleigh scattering).
* Hazel: Hazel eyes are a mix of brown, green, and gold. The amount of melanin varies, causing the color to appear to shift depending on lighting.
* Green: Green eyes have a low amount of melanin, but more than blue eyes. They also have a yellowish pigment called lipochrome.
* Gray: Gray eyes are similar to blue eyes in that they have a low amount of melanin. However, they have more collagen in the stroma (the layer behind the iris), which scatters light differently and gives them a gray appearance.
* Amber: Amber eyes have a yellowish or golden hue. They contain a pigment called lipochrome, but unlike hazel eyes, they don't have any brown or green tones.
* Red/Pink: Red or pink eyes are rare and typically only occur in individuals with albinism. Due to the lack of melanin, blood vessels become visible through the iris, resulting in a red or pink appearance.
It's important to note that eye color can appear to change depending on lighting conditions and the colors of clothing or makeup.