Tiny, fibrous imperfections within the stone cause the chatoyancy characteristic that characterises a 1 carat cat’s eye stone. The cat’s eye effect is caused by these inclusions, which function as microscopic, aligned tubes that reflect light into a concentrated beam. The value of a one carat cat’s eye stone is largely dependent on the quality of this effect. An aura of mystery and intrigue is added by a crisp, well-defined band of light centred in the stone, which is highly sought after. Even though they are technically flaws, the inclusions themselves add to the stone’s distinct character and cat’s eye look.