A diamond's cut is not only about its shape, but how effectively the stone can return light back to the viewer's eye. A well cut diamond will appear very brilliant and fiery, while more poorly cut stones may appear dark and lifeless, regardless of color and clarity.
Understanding Brilliance, Dispersion and Scintillation
Well-proportioned diamonds exhibit three different properties; Brilliance, Dispersion and Scintillation. As light strikes a diamond's surface it will either reflect off the table of a polished stone or enter into a diamond. The light the reflects is considered part of the diamond's brilliance. Brilliance is the flash of white light one will see when looking at a stone. As light travels into a stone, some rays are divided into flashes of color. This is called dispersion. Fire is the result of dispersion, which is the separation of white light into its spectral colors. As the observer moves the diamond back and forth, the flashes of colors are called the "scintillation."
Diamond Key
Crown : The top part of a diamond extending from the table to the girdle.
Culet : The small/pointed facet at the very bottom of a polished stone.
Depth : The total height of a diamond measured from the table to the culet.
Diamater : Width of a polished stone, measured from edge to edge.
Girdle : The very edge of a diamond where the crown and the pavilion meet.
Pavilion : The bottom part of a diamond extending from the girdle down to the culet.
Table : Largest polished facet located on top of the diamond.
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