Standard report for brilliant

General information

Model st5
Expert name Makoed A.G.
Report date 09.12.2007
Real weight, ct
Calculated weight, ct 0.75, 0.7502
Appraiser title GIA_PCTG_StarCul
Overall cut quality E
Symmetry appraiser title Internal
Overall symmetry quality VG
Spread -0.01 ct, -0.95%
AGS Spread -0.01 ct, -1.27%
Measurements 5.854 (5.842-5.861) x 3.607 / 0.009 mm
Girdle to MIC 0.009 mm
Extra Facet / Nat No
 

Average values, mm

Diameter 5.854
Crown height 0.852
Pavilion depth 2.574
Total height 3.607
Table 3.370
Culet 0.021
Girdle Bezel 0.180
Girdle Bone 0.185
Girdle Valley 0.088

 

Parameter

Avg

Min

Max

Dev

Cut

Sym

1

2

3

4

5

6

7

8

Diameter, mm 5.854 5.842 5.861 0.33% E EX 5.857 5.851 5.854 5.856        
Crown angle, 34.44 34.29 34.51 0.23 Grading EX 34.40 34.39 34.48 34.49 34.47 34.48 34.29 34.51
Pavilion angle, 41.45 41.19 41.72 0.53 Grading EX 41.64 41.45 41.31 41.19 41.26 41.41 41.63 41.72
Total height, % 61.62       E                  
Crown height, % 14.56 14.40 14.69 0.29 E EX 14.48 14.56 14.69 14.69 14.66 14.49 14.40 14.49
Pavilion depth, % 43.97 43.83 44.16 0.33 N/A EX 43.89 43.83 43.95 43.87 44.00 43.97 44.16 44.13
Table, % 57.57 57.53 57.60 0.07 Grading EX 57.53 57.56 57.60 57.58        
Culet, % 0.36 0.27 0.43 0.17 E EX                
Girdle Bezel, % 3.08 2.91 3.29 0.38 E EX 3.29 3.22 2.93 3.07 2.91 3.16 3.08 3.00
Girdle Bone, % 3.16 3.02 3.39 0.38   EX 3.23 3.04 3.39 3.17 3.26 3.09 3.07 3.02
Girdle Valley, % 1.51 1.29 1.88 0.59 E EX 1.64 1.88 1.43 1.43 1.40 1.75 1.36 1.40
1.48 1.46 1.73 1.38 1.55 1.32 1.29 1.67
Star:
Upper ratio, %
52.90: 52.01: 54.23: 2.22     52.75: 52.01: 52.43: 52.24: 53.37: 52.64: 54.23: 53.56:
47.10 47.99 45.77 47.25 47.99 47.57 47.76 46.63 47.36 45.77 46.44
Star angle, 22.22 22.08 22.31 0.24   EX 22.24 22.20 22.28 22.17 22.08 22.31 22.15 22.30
Upper girdle angle, 41.26 40.65 41.49 0.84   EX 41.28 41.28 41.09 41.46 41.03 41.35 41.18 41.30
41.06 41.49 40.65 41.37 41.24 41.44 41.45 41.43
Lower girdle angle / Halves angle, 42.51 42.25 42.85 0.60   EX 42.67 42.52 42.50 42.40 42.35 42.25 42.25 42.25
42.27 42.37 42.54 42.65 42.71 42.77 42.85 42.75
Twist, 0.67 0.27 1.11 0.84   EX 0.95 0.99 1.11 0.34 0.37 0.37 0.27 1.00
Crown height, mm 0.852 0.843 0.860 0.017 E EX 0.847 0.852 0.860 0.860 0.858 0.848 0.843 0.848
Pavilion depth, mm 2.574 2.566 2.585 0.019 N/A EX 2.569 2.566 2.573 2.568 2.576 2.574 2.585 2.583
Table, mm 3.370 3.368 3.372 0.004 Grading EX 3.368 3.370 3.372 3.370        
Culet, mm 0.021 0.016 0.025 0.010 E EX                
Girdle Bezel, mm 0.180 0.170 0.192 0.022 E EX 0.192 0.188 0.172 0.180 0.170 0.185 0.180 0.176
Girdle Bone, mm 0.185 0.177 0.199 0.022   EX 0.189 0.178 0.199 0.186 0.191 0.181 0.180 0.177
Girdle Valley, mm 0.088 0.076 0.110 0.034 E EX 0.096 0.110 0.084 0.084 0.082 0.103 0.079 0.082
0.087 0.086 0.101 0.081 0.091 0.077 0.076 0.098
Fish eye effect, 10.54 N/A                  
Culet through Crown Bezel, 11.12 N/A                  

Measurement as per OctoNus theory

Crown angle, 34.44 34.38 34.50 0.12     34.44 34.43 34.38 34.50        
Pavilion angle, 41.45 41.43 41.47 0.04     41.45 41.43 41.47 41.45        

 

Azimuths deviation from ideal,

1

2

3

4

5

6

7

8

Pavilion 0.00 -0.14 -0.12 0.12 -0.23 0.30 -0.09 0.21
Lower girdle facets / Halves 0.10 0.13 -0.04 0.09 -0.03 0.08 0.14 0.00
0.05 0.08 0.13 0.07 -0.08 -0.00 0.03 0.08
Crown 0.95 0.86 0.99 0.46 0.14 0.68 0.17 1.21
Upper girdle facets 0.39 0.34 -0.40 0.24 -0.36 0.36 -0.21 -0.29
-1.06 0.49 -1.02 0.49 -0.48 1.56 0.23 0.93
Star facets 1.85 1.46 1.31 1.19 1.91 1.59 1.58 2.00

 
Girdle center Culet center Table center

Offset

Girdle-Culet offset by table axis 0.37 0.22, % 0.022 0.013, mm
Girdle-Table offset by table axis 0.13 0.19, % 0.007 0.011, mm
Table-Culet offset by table axis 0.35 0.23, % 0.020 0.014, mm
Girdle to table-culet line offset 0.35, % 0.020, mm

Culet shift ratio by main diameter

 

Main diameter (avg) 5.854, 100%
Width-wise culet shift ratio 2.956 mm, 50.49 % 2.901 mm, 49.56 %
Lengh-wise culet shift ratio 2.915 mm, 49.80 % 2.939 mm, 50.21 %

Paint / Dug

Avg

Type

Sym

Max

Dev

Sym

Crown painting, -0.44 Painting EX -1.70 2.45 EX
Crown painting, notches 0.1, Very small 0.5 0.7
Pavilion painting, -0.01 EX 0.28 0.55 EX
Pavilion painting, notches 0.0, Negligible 0.1 0.1

Paint / Dug

1

2

3

4

5

6

7

8

Crown painting, -0.56 0.52 -1.26 0.75 -1.35 0.10 -0.67 0.43
-1.20 0.18 -1.70 -0.32 -0.65 -0.35 -0.97 0.02
Crown painting, notches 0.1 0.1 0.3 0.2 0.4 0.0 0.2 0.1
0.3 0.0 0.5 0.1 0.2 0.1 0.3 0.0
Pavilion painting, 0.10 -0.27 0.10 -0.21 0.09 0.04 0.02 -0.23
0.28 0.22 -0.18 -0.17 0.02 0.22 -0.18 -0.08
Pavilion painting, notches 0.0 0.1 0.0 0.1 0.0 0.0 0.0 0.1
0.1 0.1 0.0 0.0 0.0 0.1 0.0 0.0

 
Cut parameters description

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