The appearance, or extent, of internal and
external reflections of "white" light seen
in a polished diamond when it is viewed face-up.
A description of the care that went into
the crafting of a polished diamond, as seen in the
finish (polish and symmetry) of the diamond.
Decisions made during the fashioning process
that determine a diamond's physical shape, as seen
in a diamond's proportions, weight ratio, and durability.
The characteristic of a polished diamond
that accounts for the risk of damage inherent in its
proportions (i.e., the risk of chipping in diamonds
with extremely thin girdles).
The sum appearance (brightness,
fire, and scintillation) of a polished diamond when
it is viewed in the table-up position. This appearance
includes what is seen when the diamond is "rocked" or "tilted."
The appearance, or extent, of spots of light dispersed
into spectral colors seen in a polished diamond when
it is viewed face-up.
A calculated numerical result obtained through
computer modeling; for the GIA diamond cut research
project, metrics were calculated for brightness and
fire for both hypothetical and actual diamonds.
Overall cut appearance and quality
A description of
a polished diamond that includes the face-up appearance,
design, and craftsmanship of that diamond.
1. Sparkle: The appearance, or extent,
of spots of light seen in a polished diamond when it
is viewed face-up that flash as the diamond, observer,
or light source moves.
2. Pattern: The relative size,
arrangement, and contrast of bright and dark areas
that result from the internal and external reflections
seen in a polished diamond when it is viewed face-up
while that diamond is still or moving.
A description of a diamond's overall weight
in relation to its diameter.
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