Greek myth does not give Hecate a eye color.
In Greek mythology, Persephone's eyes are often described as dark and mysterious, reflecting her dual nature as both queen of the underworld and goddess of spring.
The goddess Athena was said to have gray eyes.
Persephone, being a Greek goddess, may change her appearance (thus eye color) at will.
Athena, the Greek goddess of wisdom, had gray eyes.
Hestia the greek goddess of hearth and fire and family has the color brownish eyes
Athena (Greek mythology)
Persephone, being a goddess, could change the color of her eyes at will.
The goddess known for her gray eyes is Athena, the Greek goddess of wisdom and warfare. She is often depicted with sharp, penetrating gray eyes that symbolize her keen intellect and keen perception.
In The Odyssey, Homer refers to Athena as the "Grey-eyed goddess."So, it is assumed they are grey.
Athena is typically depicted as having gray eyes.
I believe that they are either green or brown
Aqua (changing from Blue to Green) seems most likely to me because her parents were of the sea ...