Summary
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T898
Measurements: 6.43 × 6.40 - 4.00mm (62.2%)
Grades
Shape
Round
Cut
Excellent
Carat Weight
1.01ct
Polish
Excellent
Color
L
Symmetry
Excellent
Clarity
SI2
Fluorescence
None
Girdle
MED – STK
Culet
NON
Inclusion Details
–
Certificate
GIA 2136273512
Optical Performance Evaluation among RBC
Cut Performance
0.95
P F G VG EX OU
Fire
0.83
P F G VG EX OU
Brilliance
0.99
P F G VG EX OU
Optical Symmetry
8.19
P F G VG EX OU
Spread
-0.03ct
-3.4%
Face-Up Fluorescence
V STR STR MED FNT NON 100%
Fire
▶︎
Fire
Office
▶︎
Office
ASET White
ASET White
Arrows
Arrows
Hearts
Hearts
Color UV Free Photo
Color UV Free Photo
Color Outdoor
Color Outdoor
Color Lab
Color Lab
Face-up Fluorescence
▶︎
Face-up Fluorescence
Fluorescence
Fluorescence
Darkfield
▶︎
Darkfield
Vertical 360
▶︎
Vertical 360
Cut Performance
Cut performance is an aggregate diamond characteristic, based on both fire and brilliance. It shows how vibrant the diamond is.
Fire

Fire is colored flashes that we observe in colorless diamond. Perceived Fire strength depends on colored flashes quantity, size, duration, brightness, saturation and distribution.

Fire is the simultaneous (local) contrast of colour that is observed in a diamond. The contrast of this colored image depends on surrounding areas and on the duration of a colored flash.

If the colored flash is too fast the eye is not able to comprehend its colour and such a flash is perceived as scintillation. If the colored flash lasts too long its total contrast is less than the sum of the contrast of two separate shorter colored flashes of half the lifetime of the initial flash.

For a flash to be perceived as colored it should not be neither too fast, too small or too bright; when combined these factors make a colored flash appears to a human as scintillation and not a fire flash.

Brilliance
Diamond brilliance is an illusion caused by the fact that the perceived brightness of the object significantly exceeds its actual brightness. This may occur when several parts of the object with different brightness are observed within a single space-time domain. In the case of a diamond, these parts are its virtual facets. Two virtual facets belong to the same space-time domain when an observer can not separate them due to spatial or temporal limitations of the sense of vision.
Optical Symmetry
Optical symmetry shows how symmetric diamond looks when viewed face-up. Score is calculated from crown (ASET) image for fancy shapes and crown (ASET) and pavilion (Hearts) images for round shapes.
Spread
Diamond with the same weight can have different visible size depending on their shape. This visual size is described by spread characteristic. Positive spread means that diamond looks larger than Tolkowsky round with same weight, negative means opposite.
Face-up Fluorescence
Face-up fluorescence score show percentages of diamond area that belongs to different fluorescence grade for diamond image taken face-up in UV 385nm light.
Scores Description

Absolute score (value)

Shows absolute characteristic of diamond (how much fire or brilliance is it).

Relative score (grade)

Valid for Spread, Fire, Brilliance and Cut Performance. Shows comparison to standard Tolkowsky round with the same visual area. For example:
Fire absolute = 1.4
Fire Score for Tolkowsky with same area 1.5
Relative = 1.4/1.5 = 0.93
Grade is calculated from Relative score. Grade marker width shows value accuracy.
Spread
Diamond with the same weight can have different visible size depending on their shape. This visual size is described by spread characteristic. Positive spread means that diamond looks larger than Tolkowsky round with same weight, negative means opposite.