Standard report for brilliant

General information

Model st1
Expert name Makoed A.G.
Report date 09.12.2007
Real weight, ct
Calculated weight, ct 0.74, 0.7451
Appraiser title GIA_PCTG_StarCul
Overall cut quality V
Symmetry appraiser title Internal
Overall symmetry quality VG
Spread 0.00 ct, 0.24%
AGS Spread -0.00 ct, -0.07%
Measurements 5.851 (5.838-5.865) x 3.626 / 0.004 mm
Girdle to MIC 0.004 mm
Extra Facet / Nat No
 

Average values, mm

Diameter 5.851
Crown height 0.876
Pavilion depth 2.598
Total height 3.626
Table 3.295
Culet 0.019
Girdle Bezel 0.153
Girdle Bone 0.174
Girdle Valley 0.069

 

Parameter

Avg

Min

Max

Dev

Cut

Sym

1

2

3

4

5

6

7

8

Diameter, mm 5.851 5.838 5.865 0.46% E EX 5.852 5.844 5.847 5.851        
Crown angle, 34.50 34.13 34.74 0.61 Grading VG 34.74 34.70 34.61 34.65 34.24 34.13 34.25 34.67
Pavilion angle, 41.71 41.39 42.13 0.74 Grading VG 41.40 41.39 41.52 41.78 41.97 42.13 41.97 41.52
Total height, % 61.98       E                  
Crown height, % 14.96 14.67 15.23 0.56 E EX 14.82 15.00 15.21 15.23 14.99 14.93 14.67 14.87
Pavilion depth, % 44.40 44.05 44.73 0.68 N/A EX 44.68 44.27 44.06 44.05 44.19 44.62 44.73 44.61
Table, % 56.32 56.09 56.48 0.40 Grading EX 56.48 56.09 56.30 56.42        
Culet, % 0.33 0.21 0.40 0.19 E EX                
Girdle Bezel, % 2.61 2.42 2.78 0.36 E EX 2.48 2.72 2.71 2.71 2.78 2.42 2.58 2.49
Girdle Bone, % 2.98 2.70 3.14 0.43   EX 2.93 2.81 3.08 3.12 2.70 3.14 2.90 3.13
Girdle Valley, % 1.17 0.96 1.39 0.43 E EX 1.29 1.23 1.14 1.21 1.10 1.17 1.22 1.11
1.22 0.96 0.96 1.25 1.39 1.04 1.26 1.22
Star:
Upper ratio, %
56.02: 54.07: 57.10: 3.03     56.64: 56.75: 54.07: 54.49: 55.70: 56.92: 56.49: 57.10:
43.98 45.93 42.90 43.36 43.25 45.93 45.51 44.30 43.08 43.51 42.90
Star angle, 22.93 22.76 23.04 0.28   EX 23.04 22.93 23.04 22.76 22.87 22.87 22.99 22.96
Upper girdle angle, 41.11 40.18 42.14 1.95   VG 41.49 41.64 42.14 41.77 41.10 40.92 41.20 40.84
41.21 40.94 40.18 40.87 40.68 40.82 40.88 41.14
Lower girdle angle / Halves angle, 42.72 42.22 43.27 1.05   VG 42.22 42.33 42.37 42.53 42.46 42.70 42.94 43.04
43.19 43.27 43.09 43.05 42.82 42.71 42.42 42.35
Twist, 0.84 0.27 1.31 1.04   VG 0.98 1.21 0.62 1.31 1.03 0.27 0.97 0.34
Crown height, mm 0.876 0.858 0.891 0.033 E EX 0.867 0.877 0.890 0.891 0.877 0.874 0.858 0.870
Pavilion depth, mm 2.598 2.577 2.617 0.040 N/A EX 2.614 2.590 2.578 2.577 2.586 2.611 2.617 2.610
Table, mm 3.295 3.282 3.305 0.023 Grading EX 3.305 3.282 3.294 3.301        
Culet, mm 0.019 0.012 0.023 0.011 E EX                
Girdle Bezel, mm 0.153 0.142 0.163 0.021 E EX 0.145 0.159 0.159 0.158 0.163 0.142 0.151 0.146
Girdle Bone, mm 0.174 0.158 0.184 0.025   EX 0.171 0.165 0.180 0.182 0.158 0.184 0.170 0.183
Girdle Valley, mm 0.069 0.056 0.081 0.025 E EX 0.075 0.072 0.067 0.071 0.064 0.069 0.072 0.065
0.071 0.056 0.056 0.073 0.081 0.061 0.074 0.071
Fish eye effect, 12.35 N/A                  
Culet through Crown Bezel, 9.45 N/A                  

Measurement as per OctoNus theory

Crown angle, 34.50 34.42 34.66 0.24     34.49 34.42 34.43 34.66        
Pavilion angle, 41.71 41.65 41.76 0.11     41.68 41.76 41.74 41.65        

 

Azimuths deviation from ideal,

1

2

3

4

5

6

7

8

Pavilion 0.00 -2.43 -0.06 -0.28 -0.31 -1.19 0.06 -0.14
Lower girdle facets / Halves -2.81 -0.94 -2.44 -0.43 -2.13 0.26 -0.62 -0.29
1.04 -0.82 -1.44 -0.07 -1.48 -1.36 -1.50 0.36
Crown -0.98 -1.22 -0.69 -1.59 -1.34 -0.92 -0.92 -0.48
Upper girdle facets -1.75 0.14 -1.33 0.11 -1.52 -0.24 -1.89 -0.19
-1.32 -0.16 -3.08 0.65 -2.28 1.17 -2.69 0.69
Star facets -0.18 -0.93 -1.11 -1.10 0.22 0.21 0.31 -0.14

 
Girdle center Culet center Table center

Offset

Girdle-Culet offset by table axis 0.75 0.22, % 0.044 0.013, mm
Girdle-Table offset by table axis 0.34 0.19, % 0.020 0.011, mm
Table-Culet offset by table axis 0.99 0.23, % 0.058 0.014, mm
Girdle to table-culet line offset 0.99, % 0.058, mm

Culet shift ratio by main diameter

 

Main diameter (avg) 5.851, 100%
Width-wise culet shift ratio 2.882 mm, 49.25 % 2.970 mm, 50.77 %
Lengh-wise culet shift ratio 2.920 mm, 49.91 % 2.926 mm, 50.02 %

Paint / Dug

Avg

Type

Sym

Max

Dev

Sym

Crown painting, -1.13 Painting EX -2.21 2.23 EX
Crown painting, notches 0.3, Small 0.6 0.6
Pavilion painting, -0.51 Painting EX -2.81 4.16 EX
Pavilion painting, notches 0.1, Very small 0.7 1.1

Paint / Dug

1

2

3

4

5

6

7

8

Crown painting, -0.77 -1.36 -0.11 -0.80 -0.84 -1.35 -0.30 -1.16
0.02 -0.75 -2.16 -1.57 -1.37 -1.65 -2.21 -1.67
Crown painting, notches 0.2 0.4 0.0 0.2 0.2 0.4 0.1 0.3
0.0 0.2 0.6 0.4 0.4 0.4 0.6 0.4
Pavilion painting, -2.81 -1.49 -0.01 0.37 -2.07 -0.54 -0.34 -0.02
1.35 -0.37 -0.26 0.13 -1.54 1.23 -1.37 -0.36
Pavilion painting, notches 0.7 0.4 0.0 0.1 0.6 0.1 0.1 0.0
0.4 0.1 0.1 0.0 0.4 0.3 0.4 0.1

 
Cut parameters description

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