First, two factors can determine our eye color, one is the eye's iris and the other is melanin. To put it simply, your eye's iris contains how much melanin, your eyes will present what color. Hazel eyes often present brown or green, so sometimes people take mistake that hazel eyes is brown or green. It is quite common in Caucasoid population, especially people who are intermixed with blue, green and brown eye color. I think it's beautiful. Since my eye color is black, I am so envy people who have different eye color. I think hazel color is bright, and it likes cat's eye. It gives me an impression the guy is mysterious.