Standard report for brilliant

General information

Model st3_2
Expert name Makoed A.G.
Report date 09.12.2007
Real weight, ct
Calculated weight, ct 0.74, 0.7422
Appraiser title GIA_PCTG_StarCul
Overall cut quality V
Symmetry appraiser title Internal
Overall symmetry quality VG
Spread -0.00 ct, -0.20%
AGS Spread -0.00 ct, -0.54%
Measurements 5.842 (5.833-5.851) x 3.551 / 0.005 mm
Girdle to MIC 0.005 mm
Extra Facet / Nat No
 

Average values, mm

Diameter 5.842
Crown height 0.913
Pavilion depth 2.473
Total height 3.551
Table 3.342
Culet 0.021
Girdle Bezel 0.164
Girdle Bone 0.172
Girdle Valley 0.070

 

Parameter

Avg

Min

Max

Dev

Cut

Sym

1

2

3

4

5

6

7

8

Diameter, mm 5.842 5.833 5.851 0.31% E EX 5.842 5.851 5.847 5.844        
Crown angle, 36.08 36.00 36.20 0.20 Grading EX 36.20 36.15 36.09 36.04 36.08 36.00 36.04 36.07
Pavilion angle, 40.34 40.27 40.46 0.18 Grading EX 40.33 40.27 40.28 40.27 40.35 40.37 40.46 40.40
Total height, % 60.79       E                  
Crown height, % 15.63 15.52 15.73 0.21 E EX 15.73 15.71 15.69 15.56 15.63 15.52 15.55 15.66
Pavilion depth, % 42.34 42.19 42.50 0.31 N/A EX 42.19 42.22 42.36 42.32 42.42 42.39 42.50 42.31
Table, % 57.20 57.11 57.30 0.19 Grading EX 57.11 57.30 57.25 57.15        
Culet, % 0.36 0.24 0.44 0.20 E EX                
Girdle Bezel, % 2.81 2.72 2.88 0.16 E EX 2.87 2.86 2.75 2.86 2.72 2.88 2.74 2.78
Girdle Bone, % 2.95 2.80 3.11 0.31   EX 3.00 2.80 3.09 3.11 2.90 2.97 2.85 2.89
Girdle Valley, % 1.19 1.06 1.34 0.27 E EX 1.12 1.34 1.11 1.14 1.06 1.23 1.32 1.20
1.20 1.22 1.23 1.21 1.08 1.22 1.14 1.30
Star:
Upper ratio, %
52.36: 51.36: 53.36: 2.00     52.70: 51.36: 52.44: 53.32: 52.24: 53.36: 51.80: 51.66:
47.64 48.64 46.64 47.30 48.64 47.56 46.68 47.76 46.64 48.20 48.34
Star angle, 23.45 23.24 23.65 0.40   EX 23.65 23.63 23.63 23.60 23.27 23.24 23.32 23.28
Upper girdle angle, 43.03 42.83 43.40 0.58   EX 43.03 43.03 42.93 42.97 42.85 42.86 42.90 43.01
43.24 43.15 43.22 43.40 42.83 42.86 43.01 43.15
Lower girdle angle / Halves angle, 41.43 41.30 41.60 0.30   EX 41.43 41.33 41.33 41.30 41.39 41.35 41.37 41.44
41.43 41.43 41.48 41.60 41.56 41.51 41.51 41.47
Twist, 0.47 0.10 1.18 1.08   VG 0.62 0.52 0.35 0.28 0.10 0.13 0.60 1.18
Crown height, mm 0.913 0.907 0.919 0.012 E EX 0.919 0.918 0.917 0.909 0.913 0.907 0.908 0.915
Pavilion depth, mm 2.473 2.465 2.483 0.018 N/A EX 2.465 2.466 2.475 2.472 2.478 2.477 2.483 2.472
Table, mm 3.342 3.336 3.347 0.011 Grading EX 3.336 3.347 3.345 3.338        
Culet, mm 0.021 0.014 0.026 0.012 E EX                
Girdle Bezel, mm 0.164 0.159 0.168 0.009 E EX 0.167 0.167 0.161 0.167 0.159 0.168 0.160 0.162
Girdle Bone, mm 0.172 0.164 0.182 0.018   EX 0.175 0.164 0.180 0.182 0.169 0.174 0.167 0.169
Girdle Valley, mm 0.070 0.062 0.078 0.016 E EX 0.066 0.078 0.065 0.066 0.062 0.072 0.077 0.070
0.070 0.071 0.072 0.071 0.063 0.071 0.067 0.076
Fish eye effect, 6.18 N/A                  
Culet through Crown Bezel, 8.85 N/A                  

Measurement as per OctoNus theory

Crown angle, 36.08 36.05 36.14 0.09     36.14 36.07 36.07 36.05        
Pavilion angle, 40.34 40.32 40.37 0.05     40.34 40.32 40.37 40.34        

 

Azimuths deviation from ideal,

1

2

3

4

5

6

7

8

Pavilion 0.00 0.33 0.41 0.53 0.46 0.44 0.38 0.03
Lower girdle facets / Halves 0.19 0.46 0.14 0.27 -0.08 0.03 0.11 0.08
-0.02 0.17 0.12 0.18 0.15 0.29 0.18 0.24
Crown 0.62 0.86 0.06 0.25 0.36 0.31 0.98 1.21
Upper girdle facets -0.01 0.74 0.43 -0.33 -0.52 0.70 -0.11 0.40
0.00 -0.10 0.08 0.60 0.46 1.11 0.81 0.44
Star facets 1.15 1.16 0.68 0.50 -0.01 0.39 0.59 0.43

 
Girdle center Culet center Table center

Offset

Girdle-Culet offset by table axis 0.18 0.22, % 0.011 0.013, mm
Girdle-Table offset by table axis 0.13 0.20, % 0.007 0.011, mm
Table-Culet offset by table axis 0.24 0.23, % 0.014 0.014, mm
Girdle to table-culet line offset 0.24, % 0.014, mm

Culet shift ratio by main diameter

 

Main diameter (avg) 5.842, 100%
Width-wise culet shift ratio 2.929 mm, 50.14 % 2.912 mm, 49.85 %
Lengh-wise culet shift ratio 2.917 mm, 49.94 % 2.929 mm, 50.14 %

Paint / Dug

Avg

Type

Sym

Max

Dev

Sym

Crown painting, -0.15 EX -0.63 1.04 EX
Crown painting, notches 0.0, Negligible 0.2 0.3
Pavilion painting, -0.06 EX 0.50 0.99 EX
Pavilion painting, notches 0.0, Negligible 0.1 0.3

Paint / Dug

1

2

3

4

5

6

7

8

Crown painting, -0.63 0.11 -0.42 0.39 -0.58 -0.45 -0.36 -0.04
-0.36 0.41 -0.23 0.38 -0.52 0.10 -0.40 0.18
Crown painting, notches 0.2 0.0 0.1 0.1 0.2 0.1 0.1 0.0
0.1 0.1 0.1 0.1 0.1 0.0 0.1 0.0
Pavilion painting, 0.19 -0.12 -0.20 0.14 -0.49 0.50 -0.42 0.38
-0.48 0.28 -0.33 0.21 -0.23 -0.26 0.15 -0.24
Pavilion painting, notches 0.1 0.0 0.1 0.0 0.1 0.1 0.1 0.1
0.1 0.1 0.1 0.1 0.1 0.1 0.0 0.1

 
Cut parameters description

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