Standard report for brilliant

General information

Model st4
Expert name Makoed A.G.
Report date 11.12.2007
Real weight, ct
Calculated weight, ct 0.70, 0.7016
Appraiser title GIA_PCTG_StarCul
Overall cut quality V
Symmetry appraiser title Internal
Overall symmetry quality VG
Spread 0.01 ct, 0.72%
AGS Spread 0.00 ct, 0.40%
Measurements 5.752 (5.745-5.762) x 3.472 / 0.008 mm
Girdle to MIC 0.008 mm
Extra Facet / Nat No
 

Average values, mm

Diameter 5.752
Crown height 0.852
Pavilion depth 2.444
Total height 3.472
Table 3.289
Culet 0.019
Girdle Bezel 0.175
Girdle Bone 0.173
Girdle Valley 0.079

 

Parameter

Avg

Min

Max

Dev

Cut

Sym

1

2

3

4

5

6

7

8

Diameter, mm 5.752 5.745 5.762 0.29% E EX 5.756 5.756 5.754 5.760        
Crown angle, 34.55 34.41 34.72 0.31 Grading EX 34.57 34.62 34.45 34.41 34.44 34.57 34.64 34.72
Pavilion angle, 40.45 40.21 40.75 0.54 Grading EX 40.22 40.29 40.55 40.75 40.74 40.56 40.29 40.21
Total height, % 60.35       E                  
Crown height, % 14.82 14.55 15.12 0.57 E EX 14.55 14.74 14.67 14.84 14.80 15.02 15.12 14.81
Pavilion depth, % 42.49 42.32 42.68 0.36 N/A EX 42.44 42.42 42.49 42.68 42.65 42.45 42.32 42.44
Table, % 57.17 56.93 57.42 0.49 Grading EX 57.42 57.10 56.93 57.22        
Culet, % 0.33 0.30 0.35 0.05 E EX                
Girdle Bezel, % 3.05 2.86 3.36 0.50 E EX 3.36 3.18 3.19 2.86 2.91 2.88 2.90 3.10
Girdle Bone, % 3.01 2.64 3.35 0.71   VG 3.28 3.05 2.75 2.86 3.13 3.00 2.64 3.35
Girdle Valley, % 1.37 1.10 1.72 0.62 E EX 1.42 1.54 1.57 1.46 1.22 1.20 1.21 1.10
1.41 1.39 1.46 1.40 1.13 1.20 1.52 1.72
Star:
Upper ratio, %
54.67: 53.08: 56.19: 3.12     55.66: 54.26: 54.15: 56.19: 55.41: 53.98: 53.08: 54.67:
45.33 46.92 43.81 44.34 45.74 45.85 43.81 44.59 46.02 46.92 45.33
Star angle, 22.79 22.74 22.99 0.24   EX 22.74 22.74 22.76 22.99 22.78 22.77 22.77 22.75
Upper girdle angle, 42.37 42.03 43.09 1.06   VG 42.37 42.40 42.14 42.12 43.09 42.81 42.42 42.27
42.47 42.36 42.05 42.21 42.03 42.32 42.38 42.43
Lower girdle angle / Halves angle, 41.53 41.26 41.87 0.61   EX 41.33 41.36 41.38 41.51 41.71 41.81 41.85 41.87
41.73 41.73 41.52 41.45 41.36 41.31 41.26 41.30
Twist, 0.40 0.01 0.87 0.87   EX 0.01 0.09 0.52 0.87 0.09 0.51 0.75 0.36
Crown height, mm 0.852 0.837 0.870 0.033 E EX 0.837 0.848 0.844 0.854 0.851 0.864 0.870 0.852
Pavilion depth, mm 2.444 2.435 2.455 0.021 N/A EX 2.441 2.440 2.444 2.455 2.453 2.442 2.435 2.441
Table, mm 3.289 3.275 3.303 0.028 Grading EX 3.303 3.285 3.275 3.291        
Culet, mm 0.019 0.017 0.020 0.003 E EX                
Girdle Bezel, mm 0.175 0.164 0.193 0.029 E EX 0.193 0.183 0.183 0.164 0.167 0.166 0.167 0.179
Girdle Bone, mm 0.173 0.152 0.193 0.041   VG 0.189 0.176 0.158 0.165 0.180 0.172 0.152 0.193
Girdle Valley, mm 0.079 0.063 0.099 0.035 E EX 0.082 0.088 0.090 0.084 0.070 0.069 0.070 0.063
0.081 0.080 0.084 0.081 0.065 0.069 0.088 0.099
Fish eye effect, 6.68 N/A                  
Culet through Crown Bezel, 11.74 N/A                  

Measurement as per OctoNus theory

Crown angle, 34.55 34.50 34.59 0.09     34.50 34.59 34.54 34.56        
Pavilion angle, 40.45 40.42 40.48 0.06     40.48 40.43 40.42 40.48        

 

Azimuths deviation from ideal,

1

2

3

4

5

6

7

8

Pavilion 0.00 0.14 0.42 0.10 -0.44 -0.08 -0.61 -0.57
Lower girdle facets / Halves -0.30 0.12 0.00 0.22 -0.01 -0.08 -0.12 -0.15
-0.68 -0.14 -0.63 -0.57 -0.56 -0.37 -0.61 -0.43
Crown -0.01 0.23 -0.09 -0.77 -0.35 0.44 0.14 -0.93
Upper girdle facets 0.01 0.41 0.09 -0.31 1.27 -1.81 0.26 -0.35
0.44 -0.02 0.52 -0.36 0.16 -1.52 -0.88 -0.78
Star facets -0.20 -0.36 0.05 -0.35 0.13 -0.16 0.11 -0.26

 
Girdle center Culet center Table center

Offset

Girdle-Culet offset by table axis 0.48 0.22, % 0.028 0.013, mm
Girdle-Table offset by table axis 0.20 0.20, % 0.012 0.011, mm
Table-Culet offset by table axis 0.60 0.24, % 0.035 0.014, mm
Girdle to table-culet line offset 0.60, % 0.035, mm

Culet shift ratio by main diameter

 

Main diameter (avg) 5.752, 100%
Width-wise culet shift ratio 2.857 mm, 49.67 % 2.899 mm, 50.39 %
Lengh-wise culet shift ratio 2.886 mm, 50.17 % 2.867 mm, 49.85 %

Paint / Dug

Avg

Type

Sym

Max

Dev

Sym

Crown painting, 0.41 Digging EX 1.36 1.55 EX
Crown painting, notches 0.1, Very small 0.4 0.4
Pavilion painting, -0.09 EX -0.55 0.98 EX
Pavilion painting, notches 0.0, Negligible 0.1 0.3

Paint / Dug

1

2

3

4

5

6

7

8

Crown painting, 0.02 -0.18 -0.13 0.22 1.36 1.04 1.04 -0.01
0.80 0.45 0.08 0.50 0.02 0.59 0.05 0.77
Crown painting, notches 0.0 0.0 0.0 0.1 0.4 0.3 0.3 0.0
0.2 0.1 0.0 0.1 0.0 0.2 0.0 0.2
Pavilion painting, -0.30 0.02 -0.14 0.20 -0.44 0.18 -0.22 -0.29
-0.24 0.07 -0.55 -0.03 0.04 -0.20 -0.03 0.43
Pavilion painting, notches 0.1 0.0 0.0 0.1 0.1 0.0 0.1 0.1
0.1 0.0 0.1 0.0 0.0 0.1 0.0 0.1

 
Cut parameters description

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