Final answer:
False A high-quality diamond sparkles with flashes of brilliant color when illuminated by white light due to dispersion.
Step-by-step explanation:
A high-quality diamond can sparkle with flashes of brilliant color when illuminated by white light due to a phenomena called dispersion, which is the separation of white light into its component colors. This happens because diamonds have a high refractive index, which causes light to slow down and bend as it enters the diamond. As the light passes through the diamond, it gets separated into its component colors and creates a beautiful display of colors.