Related Clues:

• It's usually blue, green or brown
• Georgia O'Keeffe subject
• Spectrum part
• Pupil's milieu
• Where the pupil sits?
• Perennial flower
• Pupil setting
• It's surrounded by white
• The cornea covers it
• Pale purple shade
• It may be bearded
• Ring around a pupil
• Goddess of the rainbow
• Dye plant
• You can see through it