Standard report for brilliant

General information

Model st9
Expert name Makoed A.G.
Report date 09.12.2007
Real weight, ct
Calculated weight, ct 0.71, 0.7120
Appraiser title GIA_PCTG_StarCul
Overall cut quality E
Symmetry appraiser title Internal
Overall symmetry quality VG
Spread 0.00 ct, 0.49%
AGS Spread 0.00 ct, 0.17%
Measurements 5.775 (5.765-5.783) x 3.511 / 0.004 mm
Girdle to MIC 0.004 mm
Extra Facet / Nat No
 

Average values, mm

Diameter 5.775
Crown height 0.845
Pavilion depth 2.496
Total height 3.511
Table 3.318
Culet 0.021
Girdle Bezel 0.170
Girdle Bone 0.186
Girdle Valley 0.083

 

Parameter

Avg

Min

Max

Dev

Cut

Sym

1

2

3

4

5

6

7

8

Diameter, mm 5.775 5.765 5.783 0.31% E EX 5.777 5.782 5.774 5.772        
Crown angle, 34.48 34.34 34.56 0.22 Grading EX 34.56 34.52 34.54 34.41 34.46 34.48 34.34 34.54
Pavilion angle, 40.94 40.75 41.05 0.30 Grading EX 40.86 40.80 40.75 40.97 41.02 41.05 41.05 41.01
Total height, % 60.80       E                  
Crown height, % 14.63 14.40 14.89 0.49 E EX 14.45 14.60 14.89 14.79 14.74 14.69 14.40 14.45
Pavilion depth, % 43.22 42.88 43.64 0.75 N/A VG 43.58 43.28 42.88 42.98 42.95 43.09 43.36 43.64
Table, % 57.46 57.29 57.57 0.28 Grading EX 57.56 57.57 57.29 57.40        
Culet, % 0.37 0.28 0.44 0.16 E EX                
Girdle Bezel, % 2.95 2.72 3.11 0.39 E EX 2.77 2.92 2.98 3.03 3.11 3.02 3.05 2.72
Girdle Bone, % 3.23 3.03 3.32 0.30   EX 3.23 3.21 3.03 3.27 3.29 3.24 3.22 3.32
Girdle Valley, % 1.44 1.14 1.66 0.53 E EX 1.34 1.51 1.52 1.46 1.41 1.36 1.50 1.28
1.55 1.66 1.49 1.50 1.42 1.14 1.39 1.55
Star:
Upper ratio, %
53.76: 52.77: 54.91: 2.14     53.51: 52.77: 53.14: 53.24: 53.86: 54.33: 54.30: 54.91:
46.24 47.23 45.09 46.49 47.23 46.86 46.76 46.14 45.67 45.70 45.09
Star angle, 22.41 22.18 22.69 0.51   EX 22.25 22.42 22.55 22.38 22.53 22.69 22.18 22.28
Upper girdle angle, 41.01 40.70 41.35 0.65   EX 41.09 41.19 41.35 41.01 40.88 41.21 40.84 40.70
40.93 40.97 41.04 41.26 40.85 40.97 40.96 40.95
Lower girdle angle / Halves angle, 42.03 41.84 42.17 0.33   EX 41.91 41.89 41.84 41.84 41.84 42.07 42.10 42.11
42.15 42.09 42.11 42.11 42.17 42.17 42.08 42.01
Twist, 0.47 0.05 1.01 0.96   EX 1.01 1.00 0.57 0.24 0.18 0.05 0.47 0.20
Crown height, mm 0.845 0.831 0.860 0.029 E EX 0.834 0.843 0.860 0.854 0.851 0.849 0.831 0.834
Pavilion depth, mm 2.496 2.477 2.520 0.044 N/A VG 2.517 2.500 2.477 2.482 2.481 2.489 2.504 2.520
Table, mm 3.318 3.309 3.325 0.016 Grading EX 3.324 3.325 3.309 3.315        
Culet, mm 0.021 0.016 0.025 0.009 E EX                
Girdle Bezel, mm 0.170 0.157 0.179 0.022 E EX 0.160 0.169 0.172 0.175 0.179 0.174 0.176 0.157
Girdle Bone, mm 0.186 0.175 0.192 0.017   EX 0.187 0.185 0.175 0.189 0.190 0.187 0.186 0.192
Girdle Valley, mm 0.083 0.066 0.096 0.030 E EX 0.078 0.087 0.088 0.084 0.081 0.078 0.087 0.074
0.089 0.096 0.086 0.086 0.082 0.066 0.081 0.090
Fish eye effect, 8.52 N/A                  
Culet through Crown Bezel, 11.72 N/A                  

Measurement as per OctoNus theory

Crown angle, 34.48 34.44 34.51 0.07     34.51 34.50 34.44 34.48        
Pavilion angle, 40.94 40.90 40.99 0.09     40.94 40.93 40.90 40.99        

 

Azimuths deviation from ideal,

1

2

3

4

5

6

7

8

Pavilion 0.00 0.31 0.65 0.66 0.68 0.50 0.47 0.01
Lower girdle facets / Halves 0.22 0.51 0.18 0.31 0.26 0.17 0.13 0.46
0.46 0.52 0.26 0.31 0.10 0.19 0.06 0.18
Crown 1.01 1.32 1.22 0.42 0.50 0.56 0.01 0.21
Upper girdle facets -0.13 2.20 1.10 2.10 0.36 0.48 -0.75 1.44
-0.70 1.24 -0.76 0.16 -1.35 1.46 -1.13 2.06
Star facets 1.30 1.72 0.89 1.45 0.90 0.66 0.76 1.08

 
Girdle center Culet center Table center

Offset

Girdle-Culet offset by table axis 0.42 0.22, % 0.024 0.013, mm
Girdle-Table offset by table axis 0.43 0.20, % 0.025 0.011, mm
Table-Culet offset by table axis 0.81 0.24, % 0.047 0.014, mm
Girdle to table-culet line offset 0.81, % 0.047, mm

Culet shift ratio by main diameter

 

Main diameter (avg) 5.775, 100%
Width-wise culet shift ratio 2.858 mm, 49.49 % 2.919 mm, 50.54 %
Lengh-wise culet shift ratio 2.887 mm, 49.99 % 2.887 mm, 49.99 %

Paint / Dug

Avg

Type

Sym

Max

Dev

Sym

Crown painting, -0.91 Painting EX -1.35 1.29 EX
Crown painting, notches 0.2, Very small 0.4 0.3
Pavilion painting, -0.06 EX -0.53 1.01 EX
Pavilion painting, notches 0.0, Negligible 0.1 0.3

Paint / Dug

1

2

3

4

5

6

7

8

Crown painting, -1.14 -0.88 -0.21 -0.88 -0.86 -0.06 -1.17 -0.93
-1.20 -0.68 -1.32 -0.15 -1.35 -1.25 -1.34 -1.05
Crown painting, notches 0.3 0.2 0.1 0.2 0.2 0.0 0.3 0.2
0.3 0.2 0.4 0.0 0.4 0.3 0.4 0.3
Pavilion painting, 0.22 -0.20 -0.14 0.34 -0.39 0.48 -0.53 0.23
-0.22 -0.01 -0.24 0.17 -0.37 -0.18 0.05 -0.18
Pavilion painting, notches 0.1 0.1 0.0 0.1 0.1 0.1 0.1 0.1
0.1 0.0 0.1 0.0 0.1 0.0 0.0 0.0

 
Cut parameters description

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