Rarity just looked the other unicorn into the eyes and gave a gentle chuckle. But as the words left her mouth, the tone of irritation could be found within the undertone. "Fine, you wish to know why? Well, you probably know that genes create a pony's eyecolor right? I am having a rather, rare, gene which causes to switch my eye colors. It happened at young age, that my eye color changed to sapphire blue. But over the course of time, they changed back to their original color. These red rims are my real eye color. There, happy now? Happy you know a long lasted secret of mine?"