Alexandria’s Genesis, a.k.a violet eyes (an urban myth of violet eyes).
When someone is born with Alexandria’s Genesis, their eyes are blue or gray at birth. After six months, the eyes begin to change from their original color to purple, and this process lasts six months. During puberty, the color deepens to dark purple, a deep purple, a royal purple, or a violet-blue color and remains that way. It does not affect the person’s eyesight.
Those who have this mutation will never grow any facial, body, pubic, or anal hair (not including hair on their head, on their ears, noses, eyebrows and eyelashes) Women also do not menstruate, but are fertile.
Sadly, this mutation (while violet eyes are just extremely rare) is classified as an urban myth. Still, the beauty of the explanation never ceases to fascinate all.