Summary
Clarity
Proportions
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StarRays_CC_1-54
Measurements: 6.44 × 6.40 - 3.96mm (61.7%)
Grades
Shape
Round
Cut
Excellent
Carat Weight
1.01ct
Polish
Excellent
Color
G
Symmetry
Excellent
Clarity
SI1
Fluorescence
Very Strong
Girdle
–
Culet
–
Inclusion Details
–
Certificate
–
Optical Performance Evaluation among RBC
Cut Performance
0.97
P F G VG EX OU
Fire
0.96
P F G VG EX OU
Brilliance
0.97
P F G VG EX OU
Optical Symmetry
9.22
P F G VG EX OU
Spread   v2
-0.03ct
-3.4%
Face-Up Fluorescence
V STR STR MED 100% FNT NON
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
Office
Office
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INCLUSION TYPES
Crystal
Cloud
Pin Point
Feather
Needle
Bruise
Laser Drill Hole
Indented Natural
Cavity
Natural
Chip
Etch Channel
Knot
Twinning Wisp
Extra Facet
Surface Graining
Bearding
Grain Center
Internal Graining
Polish Lines
Pits
Burn
Nick
Lizard Skin
Unknown
RELIEF
High Contrast
Moderate Contrast
Low Contrast
StarRays_CC_1-54
Tolkowsky RBC
Diamond
1.01ct
1.01ct
Weight
-0.03ct
0ct
Spread   v2
-3.4%
0.0%
Length × Width
6.435 mm
6.4 mm
Total Height
61.73%
3.964 mm
Table
56.54%
3.63 mm
Crown Angle
34.82°
Crown Height
15.07%
0.968 mm
Pavilion Angle
40.64°
Pavilion Depth Pav. Depth
42.68%
2.74 mm
Girdle
3.98%
0.256 mm
Culet
0.38%
0.024 mm
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 v2

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.

In Spread v2, the formula for calculating the relative Spread has been modified so that the resulting value is directly proportional to the absolute Spread, which makes the result more intuitive.

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 v2, 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 v2

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.

In Spread v2, the formula for calculating the relative Spread has been modified so that the resulting value is directly proportional to the absolute Spread, which makes the result more intuitive.