Kanak Khet is a term often used in the gemstone trade, particularly in India, to refer to premium quality Chrysoberyl Cat's Eye. Chrysoberyl Cat's Eye is a gemstone that exhibits a phenomenon known as chatoyancy, where a band of light moves across the surface of the stone, resembling the slit eye of a cat when it's moved. This effect is caused by the presence of parallel fibrous or needle-like inclusions within the stone. Chrysoberyl cat's eye is a rare and valuable gemstone known for its distinctive optical phenomenon called chatoyancy, which resembles the slit eye of a cat when properly cut and polished. This effect is caused by light reflecting off microscopic parallel inclusions within the crystal structure, creating a sharp band of light that moves across the surface as the stone is rotated. Chrysoberyl cat's eye typically exhibits a golden to greenish-yellow color and is highly prized in the world of gemstone collectors and jewelry enthusiasts. It is considered one of the most desirable varieties of chrysoberyl, a mineral composed of beryllium aluminum oxide. Chrysoberyl cat's eye is renowned for its rarity, durability (it measures 8.5 on the Mohs scale), and captivating visual appeal. It is often used in rings, earrings, pendants, and other forms of fine jewelry. The most notable sources of chrysoberyl cat's eye include Sri Lanka, Brazil, India, and Madagascar. Group: Chrysoberyl Refractive index: 1.746-1.755 Birefringence: 0.008-0.010 Specific gravity: 3.73/ +0.02, -0.02 Crystal system: Orthorhombic Hardness: 8.5 Inclusions: Natural Chatoyancy