Brilliance Intensity of the internal and external reflections of white light from the crown of the diamond. Hardness, reflective index, reflectivity, polish, luster and proportions all affect a gemstone's brilliance. |
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Dispersion Separation of white light into component spectral colors, each of which vibrates at a different frequency. As light passes through a diamond, different wavelengths are refracted to different degrees and have slightly different refractive indices. Dispersion is also called Fire. |
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Scintillation Flashes of light reflected from a polished diamond, seen when either the diamond, the light source or the observer moves. Scintillation depends on the number and size of facets, the precision of the facet angles and the quality of polish. Sometimes called Sparkle. |
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