Standard report for brilliant

General information

Model st7
Expert name Makoed A.G.
Report date 09.12.2007
Real weight, ct
Calculated weight, ct 0.73, 0.7314
Appraiser title GIA_PCTG_StarCul
Overall cut quality G
Symmetry appraiser title Internal
Overall symmetry quality EX
Spread 0.01 ct, 1.20%
AGS Spread 0.01 ct, 0.88%
Measurements 5.843 (5.837-5.848) x 3.489 / 0.007 mm
Girdle to MIC 0.007 mm
Extra Facet / Nat No
 

Average values, mm

Diameter 5.843
Crown height 0.856
Pavilion depth 2.452
Total height 3.489
Table 3.368
Culet 0.020
Girdle Bezel 0.181
Girdle Bone 0.188
Girdle Valley 0.087

 

Parameter

Avg

Min

Max

Dev

Cut

Sym

1

2

3

4

5

6

7

8

Diameter, mm 5.843 5.837 5.848 0.19% E EX 5.846 5.844 5.844 5.843        
Crown angle, 34.57 34.35 34.76 0.41 Grading EX 34.59 34.76 34.74 34.64 34.63 34.36 34.35 34.48
Pavilion angle, 40.07 39.87 40.29 0.42 Grading EX 40.08 40.03 39.92 39.87 40.09 40.10 40.29 40.21
Total height, % 59.72       E                  
Crown height, % 14.65 14.52 14.86 0.34 E EX 14.69 14.86 14.70 14.64 14.65 14.54 14.60 14.52
Pavilion depth, % 41.96 41.78 42.24 0.46 N/A EX 41.78 41.84 41.83 41.79 42.19 41.96 42.24 42.04
Table, % 57.64 57.47 57.81 0.34 Grading EX 57.64 57.47 57.62 57.81        
Culet, % 0.34 0.28 0.40 0.12 E EX                
Girdle Bezel, % 3.10 2.87 3.28 0.41 E EX 3.23 3.00 3.17 3.28 2.89 3.22 2.87 3.13
Girdle Bone, % 3.22 2.96 3.42 0.47   EX 3.40 3.06 3.33 2.96 3.09 3.18 3.33 3.42
Girdle Valley, % 1.49 1.26 1.65 0.40 E EX 1.63 1.54 1.48 1.36 1.59 1.65 1.51 1.36
1.26 1.50 1.48 1.35 1.35 1.55 1.59 1.65
Star:
Upper ratio, %
55.25: 54.44: 56.17: 1.73     54.56: 54.72: 56.17: 55.04: 54.44: 55.67: 55.88: 55.49:
44.75 45.56 43.83 45.44 45.28 43.83 44.96 45.56 44.33 44.12 44.51
Star angle, 22.72 22.36 23.14 0.79   EX 22.73 22.78 22.82 23.14 22.36 22.64 22.61 22.68
Upper girdle angle, 42.16 41.90 42.46 0.56   EX 42.14 42.17 42.16 42.25 42.22 42.38 42.33 42.46
42.21 42.22 41.99 42.04 41.90 42.04 41.95 42.11
Lower girdle angle / Halves angle, 41.15 40.96 41.33 0.37   EX 41.14 41.10 41.06 41.08 41.01 40.98 40.96 41.11
41.13 41.12 41.21 41.31 41.33 41.27 41.31 41.28
Twist, 0.14 0.02 0.40 0.39   EX 0.15 0.02 0.15 0.08 0.19 0.04 0.11 0.40
Crown height, mm 0.856 0.848 0.868 0.020 E EX 0.859 0.868 0.859 0.856 0.856 0.849 0.853 0.848
Pavilion depth, mm 2.452 2.441 2.468 0.027 N/A EX 2.441 2.445 2.444 2.442 2.465 2.452 2.468 2.456
Table, mm 3.368 3.358 3.378 0.020 Grading EX 3.368 3.358 3.367 3.378        
Culet, mm 0.020 0.016 0.023 0.007 E EX                
Girdle Bezel, mm 0.181 0.168 0.192 0.024 E EX 0.189 0.175 0.185 0.192 0.169 0.188 0.168 0.183
Girdle Bone, mm 0.188 0.173 0.200 0.027   EX 0.198 0.179 0.195 0.173 0.180 0.186 0.194 0.200
Girdle Valley, mm 0.087 0.073 0.096 0.023 E EX 0.095 0.090 0.087 0.079 0.093 0.096 0.088 0.080
0.073 0.088 0.086 0.079 0.079 0.090 0.093 0.096
Fish eye effect, 4.86 N/A                  
Culet through Crown Bezel, 12.79 N/A                  

Measurement as per OctoNus theory

Crown angle, 34.57 34.55 34.61 0.06     34.61 34.56 34.55 34.56        
Pavilion angle, 40.07 40.04 40.10 0.07     40.08 40.07 40.10 40.04        

 

Azimuths deviation from ideal,

1

2

3

4

5

6

7

8

Pavilion 0.00 0.10 0.07 0.22 0.13 0.11 0.14 -0.08
Lower girdle facets / Halves -0.48 0.14 -0.19 -0.27 -0.43 -0.37 -0.12 0.34
-0.69 -0.34 -0.26 0.25 -0.47 -0.22 -0.30 -1.02
Crown 0.15 0.11 0.22 0.30 -0.06 0.06 0.03 0.32
Upper girdle facets 0.06 0.31 0.02 -0.00 -0.20 0.19 -0.07 -0.10
-0.05 -0.34 -0.34 0.22 -0.20 0.54 0.10 0.35
Star facets -0.85 -0.78 0.13 -0.70 -0.93 -0.92 -1.55 -0.69

 
Girdle center Culet center Table center

Offset

Girdle-Culet offset by table axis 0.26 0.22, % 0.015 0.013, mm
Girdle-Table offset by table axis 0.03 0.20, % 0.002 0.011, mm
Table-Culet offset by table axis 0.23 0.23, % 0.014 0.014, mm
Girdle to table-culet line offset 0.23, % 0.014, mm

Culet shift ratio by main diameter

 

Main diameter (avg) 5.843, 100%
Width-wise culet shift ratio 2.936 mm, 50.26 % 2.909 mm, 49.79 %
Lengh-wise culet shift ratio 2.919 mm, 49.96 % 2.925 mm, 50.07 %

Paint / Dug

Avg

Type

Sym

Max

Dev

Sym

Crown painting, -0.12 EX -0.43 0.83 EX
Crown painting, notches 0.0, Negligible 0.1 0.2
Pavilion painting, -0.09 EX 1.02 1.84 EX
Pavilion painting, notches 0.0, Negligible 0.3 0.5

Paint / Dug

1

2

3

4

5

6

7

8

Crown painting, -0.09 -0.19 -0.10 0.23 -0.43 0.11 -0.37 0.05
0.00 0.40 -0.40 -0.19 -0.23 -0.22 -0.22 -0.20
Crown painting, notches 0.0 0.1 0.0 0.1 0.1 0.0 0.1 0.0
0.0 0.1 0.1 0.1 0.1 0.1 0.1 0.1
Pavilion painting, -0.48 -0.05 -0.29 0.34 -0.51 0.59 -0.34 -0.21
-0.82 0.45 -0.36 -0.10 -0.62 0.14 -0.21 1.02
Pavilion painting, notches 0.1 0.0 0.1 0.1 0.1 0.2 0.1 0.1
0.2 0.1 0.1 0.0 0.2 0.0 0.1 0.3

 
Cut parameters description

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