Assertion (A): A diamond sparkles more than a glass imitation cut to the same shape. Reason (R): The refractive index of diamond is less than that of glass. In the context of the above two statements, which one of the following is correct?

1. Statement A asserts that a diamond sparkles more than a glass imitation cut to the same shape. 2. Statement R provides a reason: The refractive index of diamond is less than that of glass. 3. Diamond's sparkle (brilliance) is due to its high refractive index (around 2.42) and strong dispersion (separation of colours), which cause significant total internal reflection and 'fire'. 4. Glass typically has a lower refractive index (around 1.5-1.7). 5. Therefore, Statement A is true; diamond does sparkle more than glass imitation. 6. However, Statement R is false; the refractive index of diamond is *greater* than that of glass, not less. This high refractive index is the reason for its sparkle. 7. Since A is true and R is false, the correct option is (C).