Some believe the color green has been associated with jealousy dating back to the ancient Greeks. They believed jealousy occurred as result of the overproduction of bile, which turned human skin slightly green.

Why is jealousy a green-eyed monster?

Meaning of 'Green-Eyed Monster'

Jealousy can lead even the nicest people to do awful things. That's why it's often referred to as the 'green-eyed monster'. Because it's so universal in human nature, jealousy is a common theme in storytelling.

Is green the color of jealousy?

Green (Secondary)

Is the most restful color to the human eye and can improve vision. Dark Green is associated with ambition, greed, and jealousy. Yellow-Green can indicate sickness, cowardice, discord, and jealousy. Aqua is associated with emotional healing and protection.