Some breeds have specific eye colors, and can only be considered purebred if their eyes follow breed standards. The Russian Blue, for example, must have green eyes, while a Siamese has blue eyes. Those breeds are not the only breeds that can have blue or green eyes, but they must have those eye colors to be considered for the breed.
Some would say that you can tell the quality of a cat by the color of its eyes, but I don’t think that is necessarily true. I have known some pretty awful cats whose only redeeming qualities were their pretty blue eyes, and my favorite cat had common copper eyes.
If eyes are the windows to the soul, then we must be able to see deeply into a cat’s soul. Their eyes are disproportionately large for their head sizes, and according to the Pictures of Cats website, our eyes would be eight inches in diameter if they were the same proportion to our heads – now that would look funny! Fortunately, for cats, they pull it off well and their eyes are usually the first thing that draws us to them.
From copper, orange, amber and hazel to vivid shades of blue and green, cats have beautiful eyes. There is even a gemstone named after them, Tiger Eye.