And a diamond with an excellent cut has to have excellent or at least very good symmetry as well.
Excellent cut diamond.
The ratios and sizes of the diamond s depth width and table symmetry.
The shine and glow of the diamond surface.
For superior brilliance choose a diamond with a cut grade of very good or excellent for round diamonds and good or better in fancy shape diamonds.
When viewed from the top the light passing through such stones creates a beautiful and clear pattern of bright and dark spots.
When choosing a diamond in this range make sure its symmetry and polish are very good or excellent so that the impact of the above average cut is not obscured.
Excellent diamond cut characteristics diamonds with an excellent cut grade have proportions and symmetry that allow showing maximum brilliance fire and sparkle.
Super ideal cut diamonds have cuts with an extremely high degree of precision and angles that give them superior performance.
A seemingly minute change in the pavilion or crown angle can make a big difference to the sparkle fire and scintillation of a diamond.
The main factors impacting diamond cut quality are.
Precision of the facets mirrors windows and steps polish.
A perfect cut diamond is proportioned in such a way that nearly all the light that enters the diamond gets returned to the viewer s eye.
Conversely a well cut diamond can have a slightly lower color g h or clarity si1 si2 and still look quite beautiful due to its superior ability to create sparkle and brilliance.
That said i would advise you to go for a very good symmetry grade.
It also means that the diamond will sell at a premium.