DIAMOND FLUORESCENCE, POLISH & SYMMETRY
Image courtesy of GIA.edu
Advanced Diamond Filters
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, especially in diamonds below colour grade F.
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 excellent calibre
Scratches, lines, burn marks created by excessive heat, or rough girdles could downgrade the polish rating of a diamond.
When the facets of a diamond are well balanced and aligned, the stone has excellent symmetry, which is critical in 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
Symmetry is particularly important when choosing a fancy shape diamond.