Yes, emerald green eyes can occur naturally, but they are extremely rare. Eye color is determined by the amount and type of pigment (melanin) in the iris, as well as how light scatters through the eye.
Natural emerald green eyes are often a result of a unique combination of light brown or amber pigmentation mixed with a blue or gray undertone, creating a vivid, bright green hue. People with lighter skin tones, particularly those of European descent, may be more likely to have striking green eyes, though the shade of green can vary.
Emerald green eyes specifically are a deeper, more vibrant shade of green and are different from other common green eye colors, which might be more muted or olive-toned. This shade of green is highly rare, and it can also be influenced by lighting, surroundings, and the clothing the person is wearing, as certain factors can bring out the green tones more clearly.
In some cases, colored contact lenses can also make someone’s eyes appear emerald green, but naturally occurring emerald green eyes are very uncommon.