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The term cat's eye, or chatoyancy, is used to describe a phenomenal optical property in gemstones, in this case quartz gems. The effect, when present, appears as a bright, narrow slit similar to the pupils in the eyes of your favorite feline. This phenomenon is caused by parallel fibrous or needle-like inclusions that interfere with the passage of light throughout the crystal, scattering and reflecting light back to the viewer as a thin line.
Quartz, of Course!
Adorn yourself in the colors of the rainbow when you buy quartz from JTV's affordable quartz gemstone collection. From chaceldony, citrine, amethyst and agate, these are only a few of the varieties of this diverse gemstone. Try rutilated quartz as a unique centerpiece for your next hand-made ring. Needles in a golden to deep orange color create patterns within the rutilated quartz, making the gemstone visually intriguing.