- Brilliance diamond has extremely high reflectivity, its reflection critical angle is small, the range of total reflection is wide, light is prone to total reflection, and the amount of reflected light is large, thus producing high brightness.- Scintillation: The flicker of diamond is flash, that is, the reflection and flash of white light on its surface when the diamond or the light source and the observer move relatively. Colorless, transparent, well-crystallized octahedron or curved poly-shaped diamond, even without cutting and grinding, it can show good flashing light.- Dispersion or fire: Diamond's diverse crystal faces are like a prism, which can decompose the white light that enters the crystal through refraction, reflection and total reflection into the constituent colors of white light-red, orange, yellow, green, Blue, indigo, purple and other shades.- Luster: The outstandingly hard, smooth and shiny crystal surface or cleavage surface of corundum has a particularly strong reflection effect on white light, and this very characteristic reflection effect is called diamond luster.