Green-eyed cats are prized. Russian Blue cats should have deep, vibrant green eyes. Yellow eyes or white spots on the eyes in adult cats are considered defects, affecting their value and status. This is especially important in cat breeding and evaluation, as a cat's physical characteristics, including eye color, are a key factor in determining its worth.

Furthermore, green-eyed cats have a unique and attractive appearance; this color is not common in cats' eyes, making them especially precious. A cat's eye color is determined by genetics, and green-eyed cats are relatively rare, which is one reason why they are considered valuable.