Standard report for brilliant

General information

Model st2
Expert name Makoed A.G.
Report date 09.12.2007
Real weight, ct
Calculated weight, ct 0.73, 0.7288
Appraiser title GIA_PCTG_StarCul
Overall cut quality E
Symmetry appraiser title Internal
Overall symmetry quality VG
Spread -0.02 ct, -2.86%
AGS Spread -0.02 ct, -3.16%
Measurements 5.766 (5.727-5.778) x 3.626 / 0.002 mm
Girdle to MIC 0.002 mm
Extra Facet / Nat No
 

Average values, mm

Diameter 5.766
Crown height 0.892
Pavilion depth 2.566
Total height 3.626
Table 3.184
Culet 0.023
Girdle Bezel 0.168
Girdle Bone 0.188
Girdle Valley 0.084

 

Parameter

Avg

Min

Max

Dev

Cut

Sym

1

2

3

4

5

6

7

8

Diameter, mm 5.766 5.727 5.778 0.90% E VG 5.777 5.776 5.761 5.769        
Crown angle, 34.58 34.50 34.74 0.24 Grading EX 34.56 34.57 34.65 34.50 34.51 34.54 34.74 34.53
Pavilion angle, 41.74 41.64 41.83 0.19 Grading EX 41.73 41.73 41.64 41.79 41.83 41.71 41.76 41.76
Total height, % 62.90       E                  
Crown height, % 15.47 15.35 15.63 0.29 E EX 15.35 15.44 15.35 15.41 15.55 15.63 15.51 15.51
Pavilion depth, % 44.50 44.30 44.70 0.40 N/A EX 44.70 44.69 44.30 44.48 44.46 44.38 44.48 44.50
Table, % 55.23 55.07 55.41 0.34 Grading EX 55.28 55.07 55.41 55.14        
Culet, % 0.39 0.29 0.44 0.15 E EX                
Girdle Bezel, % 2.91 2.71 3.25 0.55 E EX 2.80 2.71 3.25 3.00 2.86 2.84 2.90 2.89
Girdle Bone, % 3.25 3.00 3.69 0.70   EX 3.21 3.11 3.69 3.24 3.35 3.22 3.00 3.20
Girdle Valley, % 1.45 1.21 2.41 1.20 E VG 1.34 1.34 1.21 1.45 2.41 2.05 1.28 1.33
1.40 1.27 1.39 1.39 1.37 1.41 1.21 1.38
Star:
Upper ratio, %
55.19: 54.13: 56.46: 2.33     55.16: 54.73: 55.13: 55.91: 56.46: 54.46: 54.13: 55.56:
44.81 45.87 43.54 44.84 45.27 44.87 44.09 43.54 45.54 45.87 44.44
Star angle, 23.64 23.53 23.81 0.28   EX 23.81 23.59 23.69 23.68 23.63 23.60 23.60 23.53
Upper girdle angle, 41.71 41.52 42.13 0.61   EX 41.72 41.72 41.81 41.52 41.53 42.13 41.63 41.70
41.63 41.68 41.69 41.73 41.66 41.75 41.81 41.69
Lower girdle angle / Halves angle, 42.74 42.60 42.98 0.39   EX 42.60 42.63 42.75 42.62 42.83 42.98 42.81 42.85
42.75 42.74 42.66 42.67 42.78 42.76 42.79 42.67
Twist, 0.28 0.02 0.52 0.50   EX 0.24 0.08 0.44 0.02 0.35 0.10 0.51 0.52
Crown height, mm 0.892 0.885 0.901 0.017 E EX 0.885 0.890 0.885 0.889 0.897 0.901 0.894 0.894
Pavilion depth, mm 2.566 2.554 2.577 0.023 N/A EX 2.577 2.577 2.554 2.564 2.563 2.559 2.565 2.566
Table, mm 3.184 3.175 3.195 0.019 Grading EX 3.187 3.175 3.195 3.179        
Culet, mm 0.023 0.017 0.025 0.009 E EX                
Girdle Bezel, mm 0.168 0.156 0.188 0.031 E EX 0.161 0.156 0.188 0.173 0.165 0.164 0.167 0.166
Girdle Bone, mm 0.188 0.173 0.213 0.040   EX 0.185 0.179 0.213 0.187 0.193 0.186 0.173 0.185
Girdle Valley, mm 0.084 0.069 0.139 0.069 E VG 0.077 0.077 0.070 0.083 0.139 0.118 0.074 0.077
0.081 0.073 0.080 0.080 0.079 0.082 0.069 0.080
Fish eye effect, 13.06 N/A                  
Culet through Crown Bezel, 7.38 N/A                  

Measurement as per OctoNus theory

Crown angle, 34.58 34.51 34.70 0.18     34.53 34.56 34.70 34.51        
Pavilion angle, 41.74 41.70 41.78 0.08     41.78 41.72 41.70 41.77        

 

Azimuths deviation from ideal,

1

2

3

4

5

6

7

8

Pavilion 0.00 -0.12 0.33 -0.26 0.38 0.43 -0.01 -0.13
Lower girdle facets / Halves -1.28 0.49 -1.55 0.10 -0.18 -2.15 -1.85 0.10
-1.25 1.49 0.35 1.94 0.15 0.78 -0.18 1.13
Crown 0.24 -0.04 -0.11 -0.28 0.03 0.33 0.50 0.39
Upper girdle facets -0.23 0.01 -0.14 0.07 -0.72 -1.61 -1.28 0.08
-0.61 0.94 0.75 0.83 0.53 0.02 -0.07 -0.42
Star facets 0.90 -0.35 -0.35 -0.93 -0.11 -0.23 0.47 0.15

 
Girdle center Culet center Table center

Offset

Girdle-Culet offset by table axis 0.29 0.22, % 0.017 0.013, mm
Girdle-Table offset by table axis 0.55 0.20, % 0.032 0.011, mm
Table-Culet offset by table axis 0.37 0.24, % 0.022 0.014, mm
Girdle to table-culet line offset 0.37, % 0.022, mm

Culet shift ratio by main diameter

 

Main diameter (avg) 5.766, 100%
Width-wise culet shift ratio 2.875 mm, 49.87 % 2.902 mm, 50.34 %
Lengh-wise culet shift ratio 2.880 mm, 49.95 % 2.882 mm, 49.98 %

Paint / Dug

Avg

Type

Sym

Max

Dev

Sym

Crown painting, -0.11 EX 1.33 2.32 EX
Crown painting, notches 0.0, Negligible 0.4 0.6
Pavilion painting, -0.60 Painting EX -1.95 3.84 EX
Pavilion painting, notches 0.2, Very small 0.5 1.0

Paint / Dug

1

2

3

4

5

6

7

8

Crown painting, -0.47 -0.05 -0.10 -0.18 -0.62 1.33 -1.00 -0.05
-0.64 -0.62 0.42 -0.33 0.03 0.38 -0.47 0.66
Crown painting, notches 0.1 0.0 0.0 0.0 0.2 0.4 0.3 0.0
0.2 0.2 0.1 0.1 0.0 0.1 0.1 0.2
Pavilion painting, -1.28 -0.61 -1.43 0.22 -0.51 1.89 -1.59 0.28
-1.63 -1.06 -0.08 -1.95 0.16 -0.91 -0.05 -1.13
Pavilion painting, notches 0.3 0.2 0.4 0.1 0.1 0.5 0.4 0.1
0.4 0.3 0.0 0.5 0.0 0.2 0.0 0.3

 
Cut parameters description

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