When the facets of a diamond are well balanced and aligned, the stone has symmetry, which is critical to creating optimal brilliance and scintillation.
Errors in symmetry include facets that are not properly aligned, improperly shaped facets, or an off-centre table reduce brilliance
POLISH
After a diamond is cut, each facet must be polished. The process can leave surface scratches or marks. If a diamond has no scratches or very minor ones, the polish is of a high degree.
Scratches, lines, burn marks created by excessive heat, or rough girdles could downgrade the polish rating of a diamond.
FLUORESCENCE
Although not so often referred to, a diamond's fluorescence refers to how it appears under ultra violet light. A diamond with strong fluorescence will appear more luminous in these conditions (for example in a night club or under a tanning lamp). It does not impact on sparkle and is not visible under usual lighting conditions. Diamonds which fluoresce with a blue tint are sometimes preferred, escpecially if the official colour grade is below an F.
As with all other aspects of a diamond, the nature of these advanced filters inform it's overall brilliance and value.
For example, poor polishing inevitably distracts from the purity of a diamond's light reflective qualities. This in turn will subtly reduce it's fire and radiance.
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