Which phenomenon explains the sparkling brilliance of cut diamond gemstones due to multiple internal reflections exceeding the critical angle?

💡 Solution & Explanation

Total internal reflection occurs when light traveling inside a medium with a high refractive index strikes the boundary at an angle greater than the critical angle, bouncing completely back inside. Diamonds possess a very small critical angle due to their high refractive index, ensuring that entering light undergoes multiple internal reflections before exiting through specific facets, producing intense brilliance. Simple refraction only bends light rays entering or leaving the gemstone surface. Interference and diffraction contribute minor spectral dispersion effects.