Standard report for brilliant

General information

Model st6
Expert name Makoed A.G.
Report date 09.12.2007
Real weight, ct
Calculated weight, ct 0.72, 0.7275
Appraiser title GIA_PCTG_StarCul
Overall cut quality E
Symmetry appraiser title Internal
Overall symmetry quality VG
Spread 0.01 ct, 0.77%
AGS Spread 0.00 ct, 0.45%
Measurements 5.808 (5.798-5.815) x 3.578 / 0.005 mm
Girdle to MIC 0.005 mm
Extra Facet / Nat No
 

Average values, mm

Diameter 5.808
Crown height 0.846
Pavilion depth 2.570
Total height 3.578
Table 3.351
Culet 0.019
Girdle Bezel 0.161
Girdle Bone 0.167
Girdle Valley 0.065

 

Parameter

Avg

Min

Max

Dev

Cut

Sym

1

2

3

4

5

6

7

8

Diameter, mm 5.808 5.798 5.815 0.30% E EX 5.812 5.806 5.814 5.813        
Crown angle, 34.47 34.31 34.66 0.35 Grading EX 34.34 34.31 34.42 34.49 34.66 34.65 34.49 34.38
Pavilion angle, 41.61 41.51 41.77 0.26 Grading EX 41.77 41.60 41.56 41.51 41.51 41.56 41.65 41.73
Total height, % 61.60       E                  
Crown height, % 14.56 14.34 14.76 0.41 E EX 14.34 14.48 14.51 14.66 14.67 14.76 14.59 14.50
Pavilion depth, % 44.25 43.90 44.61 0.72 N/A VG 44.61 44.51 44.26 44.08 43.96 43.90 44.16 44.51
Table, % 57.71 57.50 58.00 0.50 Grading EX 58.00 57.50 57.68 57.64        
Culet, % 0.33 0.30 0.36 0.06 E EX                
Girdle Bezel, % 2.78 2.59 2.97 0.38 E EX 2.61 2.62 2.83 2.82 2.97 2.95 2.83 2.59
Girdle Bone, % 2.87 2.78 3.01 0.23   EX 2.82 2.87 2.78 2.95 3.01 2.79 2.83 2.91
Girdle Valley, % 1.13 0.95 1.34 0.39 E EX 1.02 0.95 1.00 1.02 1.20 1.13 1.26 1.19
1.34 1.28 1.08 1.13 1.21 1.03 1.11 1.05
Star:
Upper ratio, %
53.27: 52.03: 54.73: 2.70     53.33: 53.59: 52.03: 52.91: 52.89: 53.11: 53.58: 54.73:
46.73 47.97 45.27 46.67 46.41 47.97 47.09 47.11 46.89 46.42 45.27
Star angle, 22.23 22.00 22.56 0.56   EX 22.13 22.11 22.28 22.00 22.09 22.19 22.56 22.46
Upper girdle angle, 41.74 41.36 42.31 0.94   EX 41.83 41.41 42.11 41.55 42.04 41.38 42.13 42.31
42.16 41.97 41.59 41.53 41.37 41.36 41.53 41.53
Lower girdle angle / Halves angle, 42.66 42.53 42.80 0.27   EX 42.74 42.76 42.65 42.59 42.62 42.60 42.54 42.59
42.55 42.53 42.72 42.71 42.74 42.80 42.72 42.76
Twist, 0.61 0.22 1.24 1.02   VG 0.68 0.58 0.54 1.24 0.22 0.53 0.24 0.88
Crown height, mm 0.846 0.833 0.857 0.024 E EX 0.833 0.841 0.843 0.851 0.852 0.857 0.848 0.842
Pavilion depth, mm 2.570 2.549 2.591 0.042 N/A VG 2.591 2.585 2.570 2.560 2.553 2.549 2.565 2.585
Table, mm 3.351 3.339 3.369 0.029 Grading EX 3.369 3.339 3.350 3.348        
Culet, mm 0.019 0.017 0.021 0.004 E EX                
Girdle Bezel, mm 0.161 0.151 0.173 0.022 E EX 0.151 0.152 0.165 0.164 0.173 0.171 0.164 0.151
Girdle Bone, mm 0.167 0.162 0.175 0.013   EX 0.164 0.167 0.162 0.171 0.175 0.162 0.165 0.169
Girdle Valley, mm 0.065 0.055 0.078 0.023 E EX 0.059 0.055 0.058 0.059 0.070 0.066 0.073 0.069
0.078 0.074 0.063 0.066 0.070 0.060 0.065 0.061
Fish eye effect, 11.17 N/A                  
Culet through Crown Bezel, 11.23 N/A                  

Measurement as per OctoNus theory

Crown angle, 34.47 34.43 34.50 0.07     34.50 34.48 34.46 34.43        
Pavilion angle, 41.61 41.58 41.64 0.06     41.64 41.58 41.61 41.62        

 

Azimuths deviation from ideal,

1

2

3

4

5

6

7

8

Pavilion 0.00 -0.17 -0.19 -0.07 -0.27 -0.21 -0.08 0.38
Lower girdle facets / Halves -0.50 -0.66 -0.74 0.00 -0.34 -0.34 -0.31 -0.48
-0.09 0.10 -0.03 -0.05 0.14 0.36 -0.36 0.43
Crown -0.68 -0.75 -0.74 -1.32 -0.49 0.32 -0.32 -0.50
Upper girdle facets -0.17 -0.53 0.21 -0.40 0.25 -0.61 -0.15 -0.68
0.07 0.27 -0.71 -0.63 -1.19 0.11 -0.90 0.04
Star facets -0.72 -0.66 -0.25 -0.61 0.53 -0.29 0.21 -1.01

 
Girdle center Culet center Table center

Offset

Girdle-Culet offset by table axis 0.19 0.22, % 0.011 0.013, mm
Girdle-Table offset by table axis 0.13 0.20, % 0.008 0.011, mm
Table-Culet offset by table axis 0.32 0.24, % 0.019 0.014, mm
Girdle to table-culet line offset 0.32, % 0.019, mm

Culet shift ratio by main diameter

 

Main diameter (avg) 5.808, 100%
Width-wise culet shift ratio 2.899 mm, 49.92 % 2.913 mm, 50.16 %
Lengh-wise culet shift ratio 2.905 mm, 50.02 % 2.909 mm, 50.09 %

Paint / Dug

Avg

Type

Sym

Max

Dev

Sym

Crown painting, -0.01 EX 1.17 2.20 EX
Crown painting, notches 0.0, Negligible 0.3 0.6
Pavilion painting, -0.10 EX -0.74 1.22 EX
Pavilion painting, notches 0.0, Negligible 0.2 0.3

Paint / Dug

1

2

3

4

5

6

7

8

Crown painting, 0.51 -0.21 0.96 -0.34 0.99 -0.70 1.17 0.19
0.56 0.05 -1.03 0.31 -0.88 -0.61 -0.40 -0.71
Crown painting, notches 0.1 0.1 0.3 0.1 0.3 0.2 0.3 0.1
0.1 0.0 0.3 0.1 0.2 0.2 0.1 0.2
Pavilion painting, -0.50 0.49 -0.56 -0.20 -0.15 0.27 -0.23 0.21
0.18 -0.31 0.18 -0.03 0.22 0.02 -0.74 -0.43
Pavilion painting, notches 0.1 0.1 0.2 0.1 0.0 0.1 0.1 0.1
0.0 0.1 0.0 0.0 0.1 0.0 0.2 0.1

 
Cut parameters description

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