Standard report for brilliant

General information

Model st8
Expert name Makoed A.G.
Report date 09.12.2007
Real weight, ct
Calculated weight, ct 0.70, 0.7031
Appraiser title GIA_PCTG_StarCul
Overall cut quality V
Symmetry appraiser title Internal
Overall symmetry quality EX
Spread 0.01 ct, 1.65%
AGS Spread 0.01 ct, 1.32%
Measurements 5.770 (5.764-5.776) x 3.453 / 0.001 mm
Girdle to MIC 0.001 mm
Extra Facet / Nat No
 

Average values, mm

Diameter 5.770
Crown height 0.851
Pavilion depth 2.428
Total height 3.453
Table 3.307
Culet 0.021
Girdle Bezel 0.174
Girdle Bone 0.167
Girdle Valley 0.076

 

Parameter

Avg

Min

Max

Dev

Cut

Sym

1

2

3

4

5

6

7

8

Diameter, mm 5.770 5.764 5.776 0.22% E EX 5.772 5.776 5.772 5.772        
Crown angle, 34.55 34.36 34.83 0.47 Grading EX 34.68 34.75 34.83 34.59 34.38 34.36 34.36 34.47
Pavilion angle, 40.16 39.97 40.32 0.35 Grading EX 40.10 39.97 39.98 40.17 40.32 40.25 40.31 40.16
Total height, % 59.84       E                  
Crown height, % 14.75 14.54 14.91 0.37 E EX 14.79 14.86 14.91 14.84 14.68 14.63 14.54 14.74
Pavilion depth, % 42.07 41.84 42.25 0.41 N/A EX 42.05 41.94 41.84 42.04 42.22 42.15 42.25 42.07
Table, % 57.30 57.14 57.47 0.33 Grading EX 57.24 57.37 57.47 57.14        
Culet, % 0.37 0.33 0.40 0.07 E EX                
Girdle Bezel, % 3.01 2.94 3.09 0.14 E EX 2.97 3.04 3.09 2.96 2.94 3.04 3.05 3.01
Girdle Bone, % 2.89 2.59 3.15 0.56   EX 2.85 3.15 2.92 2.66 2.99 2.92 3.01 2.59
Girdle Valley, % 1.33 1.05 1.58 0.53 E EX 1.14 1.39 1.55 1.58 1.26 1.25 1.05 1.21
1.26 1.37 1.50 1.27 1.53 1.49 1.24 1.14
Star:
Upper ratio, %
53.61: 52.75: 54.54: 1.79     54.17: 53.80: 53.41: 54.54: 53.18: 53.60: 53.44: 52.75:
46.39 47.25 45.46 45.83 46.20 46.59 45.46 46.82 46.40 46.56 47.25
Star angle, 22.31 21.99 22.67 0.67   EX 22.34 22.48 22.67 22.43 21.99 22.23 22.30 22.07
Upper girdle angle, 42.00 41.46 42.40 0.94   EX 42.12 41.94 42.16 42.31 42.05 42.01 42.40 42.08
41.72 41.46 41.79 41.79 42.00 42.03 41.80 42.40
Lower girdle angle / Halves angle, 41.37 41.05 41.52 0.47   EX 41.49 41.32 41.05 41.06 41.25 41.30 41.47 41.51
41.48 41.50 41.48 41.52 41.40 41.30 41.38 41.38
Twist, 0.49 0.17 0.89 0.72   EX 0.89 0.47 0.17 0.61 0.49 0.25 0.32 0.73
Crown height, mm 0.851 0.839 0.860 0.021 E EX 0.853 0.858 0.860 0.856 0.847 0.844 0.839 0.851
Pavilion depth, mm 2.428 2.414 2.438 0.024 N/A EX 2.427 2.420 2.414 2.426 2.436 2.432 2.438 2.427
Table, mm 3.307 3.297 3.316 0.019 Grading EX 3.303 3.310 3.316 3.297        
Culet, mm 0.021 0.019 0.023 0.004 E EX                
Girdle Bezel, mm 0.174 0.170 0.178 0.008 E EX 0.172 0.175 0.178 0.171 0.170 0.176 0.176 0.174
Girdle Bone, mm 0.167 0.149 0.182 0.032   EX 0.165 0.182 0.169 0.154 0.173 0.169 0.174 0.149
Girdle Valley, mm 0.076 0.061 0.091 0.030 E EX 0.066 0.080 0.089 0.091 0.073 0.072 0.061 0.070
0.072 0.079 0.086 0.073 0.088 0.086 0.071 0.066
Fish eye effect, 5.42 N/A                  
Culet through Crown Bezel, 12.36 N/A                  

Measurement as per OctoNus theory

Crown angle, 34.55 34.53 34.60 0.07     34.53 34.55 34.60 34.53        
Pavilion angle, 40.16 40.11 40.21 0.10     40.21 40.11 40.15 40.17        

 

Azimuths deviation from ideal,

1

2

3

4

5

6

7

8

Pavilion 0.00 0.66 0.64 0.87 0.77 1.05 0.58 0.11
Lower girdle facets / Halves 1.28 0.06 0.80 0.39 0.95 0.47 1.36 0.52
0.76 0.54 1.73 0.87 0.56 0.09 0.38 -0.61
Crown 0.89 1.12 0.81 0.26 0.28 0.80 0.90 0.85
Upper girdle facets 0.76 1.36 1.40 0.41 0.47 0.33 1.02 0.15
0.68 1.40 1.50 0.98 1.82 0.21 0.85 -0.36
Star facets 0.16 0.67 0.58 -0.16 0.26 0.32 0.83 0.24

 
Girdle center Culet center Table center

Offset

Girdle-Culet offset by table axis 0.10 0.22, % 0.006 0.013, mm
Girdle-Table offset by table axis 0.06 0.20, % 0.004 0.011, mm
Table-Culet offset by table axis 0.07 0.24, % 0.004 0.014, mm
Girdle to table-culet line offset 0.07, % 0.004, mm

Culet shift ratio by main diameter

 

Main diameter (avg) 5.770, 100%
Width-wise culet shift ratio 2.882 mm, 49.95 % 2.890 mm, 50.08 %
Lengh-wise culet shift ratio 2.881 mm, 49.93 % 2.891 mm, 50.10 %

Paint / Dug

Avg

Type

Sym

Max

Dev

Sym

Crown painting, 0.25 EX 1.25 1.85 EX
Crown painting, notches 0.1, Negligible 0.3 0.5
Pavilion painting, 0.34 EX 1.28 1.58 EX
Pavilion painting, notches 0.1, Negligible 0.3 0.4

Paint / Dug

1

2

3

4

5

6

7

8

Crown painting, -0.13 -0.24 0.28 0.40 -0.34 -0.07 0.76 0.13
0.41 -0.60 0.70 -0.08 0.92 0.64 0.00 1.25
Crown painting, notches 0.0 0.1 0.1 0.1 0.1 0.0 0.2 0.0
0.1 0.2 0.2 0.0 0.2 0.2 0.0 0.3
Pavilion painting, 1.28 0.60 0.14 0.24 0.31 0.39 0.49 0.25
-0.01 0.50 0.68 -0.30 -0.02 0.02 0.27 0.61
Pavilion painting, notches 0.3 0.2 0.0 0.1 0.1 0.1 0.1 0.1
0.0 0.1 0.2 0.1 0.0 0.0 0.1 0.2

 
Cut parameters description

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