Appendix III. Proportions and Measurements


 

No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

Total Depth %
GIA 63 59.8 60.6 62.2 61.9 61.9 61.5 61.5 60.9 61.8 63.0 62.8 61.5 60.4 61.2 56.9 63.0
AGS 63.2 60.1 60.8 62.6 61.8 61.8 61.4 61.2 60.8   63.0 63.4 61.6 60.8 61.4 57.3 63.4
EGL 63.1 60.4 60.7 62.4 62.3 62.1 61.8 61.9 61.1 62 63.3 63.3 61.8 60.8 61.5 57.4 63.5

Table %
GIA 55 60 61 59 53 54 56 57 57 56/57 59 58 60 56 54 62 54
AGS 54 59 60 59 54 55 57 57 57   59 58 60 55 54 61 54
EGL 54 58 60 58 54 54 56 57 57 56 59 58 60 56 53 62 54

Girdle
GIA Med
-
S.Thk
F
Med


F
Thn
-
Med
F
Thn
-
Med
F
Med


F
Thn
-
Med
F
Med


F
Thn
-
Med
F
Thn


F
Med
-
S.Thk
F
S.Thk


F
Thn
-
Thk
F
Med
-
S.Thk
Thn Med Thn
-
Med
F
Med
-
Thk
F
AGS Med
-
Thk
F
Thn
-
S.Thk
F
Thn
-
S.Thk
F
V.Thn
-
Med
F
0.9%
-
2.0%
F
0.7%
-
1.5%
F
1.5%
-
2.2%
0.7%
-
1.5%
F
0.7%
-
1.2%
F
  S.Thk


F
Thn
-
Thk
F
Med
-
Thk
Thn Thn
-
Med
Thn
-
Med
F
S.Thk
-
Thk, F
EGL Med
-
S.Thk
F
Med


F
V.Thn
-
Thn
V.Thn
-
Thn
Thn


F
Thn


F
Thn
-
med
F
0.7%
-
1.3%
Thn


F
Thn
-
Med
F
S.Thk


F
X.Thn
-
S.Thk
F
Med
-
S.Thk
SF
Thn Med
-
S.Thk
Thn
-
Med
F
S.Thk
-
Thk
F

Diameter Min (mm)
GIA 5.72 6.00 6.63 6.58 5.49 5.43 5.44 5.48 5.78 5.67 5.86 5.63 5.79 6.79 6.50 7.15 5.62
AGS 5.71 5.99 6.64 6.59 5.50 5.43 5.45 5.5 5.79   5.87 5.62 5.79 6.79 6.50 7.14 5.62
EGL 5.71 5.99 6.63 6.58 5.47 5.41 5.43 5.47 5.76 5.65 5.85 5.60 5.77 6.77 6.49 7.13 5.61

Diameter Max (mm)
GIA 5.81 6.05 6.68 6.63 5.52 5.46 5.48 5.51 5.81 5.69 5.92 5.70 5.85 6.82 6.60 7.19 5.65
AGS 5.81 6.05 6.7 6.63 5.54 5.47 5.49 5.52 5.82   5.92 5.69 5.87 6.80 6.59 7.18 5.65
EGL 5.78 6.03 6.68 6.62 5.51 5.45 5.46 5.51 5.8 5.67 5.91 5.67 5.88 6.81 6.59 7.16 5.66

Total Depth (mm)
GIA 3.63 3.6 4.03 4.11 3.41 3.37 3.36 3.38 3.53 3.51 3.71 3.56 3.58 4.11 4.01 4.08 3.55
AGS 3.61 3.62 4.05 4.14 3.41 3.37 3.36 3.37 3.53
3.71 3.58 3.59 4.13 4.02 4.10 3.57
EGL 3.63 3.63 4.04 4.12 3.42 3.37 3.37 3.39 3.54 3.51 3.72 3.57 3.59 4.12 4.02 4.10 3.57

Pavilion Angle
AGS 40.8 41.4
41.3 41.1 40.9 40.8 41.1 41
41.8 41.2 41.5 40.9 41.1 41.1 40.9
EGL               41.2                  

Pavilion Depth %
AGS 42.9 43.7 44.3 43.6 43.3 43.1 43.0 43.4 43.2   44.3 43.4 43.9 43.2 43.4 43.4 43.2
EGL 42.8 44.3 44.3 43.5 43.5 43.3 43.1 43.8 43.5 42.8 44.6 43.4 44.1 43.2 43.6 43.7 43.2

Crown Angle
AGS 35.4 32.3 33.2 34.5 34.0 34.4 34.3 34.2 34.1   35.9 37.2 34.3 34.9 33.7 29.7 34.7
EGL               34.4                  

Crown Height %
AGS 16.3 13   14.2 15.6 15.4 14.8 14.5 14.5   14.8 15.8 13.7 15.5 15.3 11.0 15.8
EGL 16.5 13.1 13.2 14.5 15.7 15.7 14.9 14.8 14.7 14.8 14.8 16.0 13.9 15.5 15.4 10.9 16.0

Culet
GIA N N N N N N N N N N N N N N N N N
AGS P P P P P P P P P   P P P P P P P
EGL N N N N N N N N N N N N N N N N N

No 1
Total Depth %
GIA 63
AGS 63.2
EGL 63.1
Table %
GIA 55
AGS 54
EGL 54
Girdle
GIA Med
-
S.Thk
F
AGS Med
-
Thk
F
EGL Med
-
S.Thk
F
Diameter Min (mm)
GIA 5.72
AGS 5.71
EGL 5.71
Diameter Max (mm)
GIA 5.81
AGS 5.81
EGL 5.78
Total Depth (mm)
GIA 3.63
AGS 3.61
EGL 3.63
Pavilion Angle
AGS 40.8
EGL  
Pavilion Depth %
AGS 42.9
EGL 42.8
Crown Angle
AGS 35.4
EGL  
Crown Height %
AGS 16.3
EGL 16.5
Culet
GIA N
AGS P
EGL N
No 2
Total Depth %
GIA 59.8
AGS 60.1
EGL 60.4
Table %
GIA 60
AGS 59
EGL 58
Girdle
GIA Med


F
AGS Thn
-
S.Thk
F
EGL Med


F
Diameter Min (mm)
GIA 6.00
AGS 5.99
EGL 5.99
Diameter Max (mm)
GIA 6.05
AGS 6.05
EGL 6.03
Total Depth (mm)
GIA 3.6
AGS 3.62
EGL 3.63
Pavilion Angle
AGS 41.4
EGL  
Pavilion Depth %
AGS 43.7
EGL 44.3
Crown Angle
AGS 32.3
EGL  
Crown Height %
AGS 13
EGL 13.1
Culet
GIA N
AGS P
EGL N
No 3
Total Depth %
GIA 60.6
AGS 60.8
EGL 60.7
Table %
GIA 61
AGS 60
EGL 60
Girdle
GIA Thn
-
Med
F
AGS Thn
-
S.Thk
F
EGL V.Thn
-
Thn
Diameter Min (mm)
GIA 6.63
AGS 6.64
EGL 6.63
Diameter Max (mm)
GIA 6.68
AGS 6.7
EGL 6.68
Total Depth (mm)
GIA 4.03
AGS 4.05
EGL 4.04
Pavilion Angle
AGS
EGL  
Pavilion Depth %
AGS 44.3
EGL 44.3
Crown Angle
AGS 33.2
EGL  
Crown Height %
AGS  
EGL 13.2
Culet
GIA N
AGS P
EGL N
No 4
Total Depth %
GIA 62.2
AGS 62.6
EGL 62.4
Table %
GIA 59
AGS 59
EGL 58
Girdle
GIA Thn
-
Med
F
AGS V.Thn
-
Med
F
EGL V.Thn
-
Thn
Diameter Min (mm)
GIA 6.58
AGS 6.59
EGL 6.58
Diameter Max (mm)
GIA 6.63
AGS 6.63
EGL 6.62
Total Depth (mm)
GIA 4.11
AGS 4.14
EGL 4.12
Pavilion Angle
AGS 41.3
EGL  
Pavilion Depth %
AGS 43.6
EGL 43.5
Crown Angle
AGS 34.5
EGL  
Crown Height %
AGS 14.2
EGL 14.5
Culet
GIA N
AGS P
EGL N
No 5
Total Depth %
GIA 61.9
AGS 61.8
EGL 62.3
Table %
GIA 53
AGS 54
EGL 54
Girdle
GIA Med


F
AGS 0.9%
-
2.0%
F
EGL Thn


F
Diameter Min (mm)
GIA 5.49
AGS 5.50
EGL 5.47
Diameter Max (mm)
GIA 5.52
AGS 5.54
EGL 5.51
Total Depth (mm)
GIA 3.41
AGS 3.41
EGL 3.42
Pavilion Angle
AGS 41.1
EGL  
Pavilion Depth %
AGS 43.3
EGL 43.5
Crown Angle
AGS 34.0
EGL  
Crown Height %
AGS 15.6
EGL 15.7
Culet
GIA N
AGS P
EGL N
No 6
Total Depth %
GIA 61.9
AGS 61.8
EGL 62.1
Table %
GIA 54
AGS 55
EGL 54
Girdle
GIA Thn
-
Med
F
AGS 0.7%
-
1.5%
F
EGL Thn


F
Diameter Min (mm)
GIA 5.43
AGS 5.43
EGL 5.41
Diameter Max (mm)
GIA 5.46
AGS 5.47
EGL 5.45
Total Depth (mm)
GIA 3.37
AGS 3.37
EGL 3.37
Pavilion Angle
AGS 40.9
EGL  
Pavilion Depth %
AGS 43.1
EGL 43.3
Crown Angle
AGS 34.4
EGL  
Crown Height %
AGS 15.4
EGL 15.7
Culet
GIA N
AGS P
EGL N
No 7
Total Depth %
GIA 61.5
AGS 61.4
EGL 61.8
Table %
GIA 56
AGS 57
EGL 56
Girdle
GIA Med


F
AGS 1.5%
-
2.2%
EGL Thn
-
med
F
Diameter Min (mm)
GIA 5.44
AGS 5.45
EGL 5.43
Diameter Max (mm)
GIA 5.48
AGS 5.49
EGL 5.46
Total Depth (mm)
GIA 3.36
AGS 3.36
EGL 3.37
Pavilion Angle
AGS 40.8
EGL  
Pavilion Depth %
AGS 43.0
EGL 43.1
Crown Angle
AGS 34.3
EGL  
Crown Height %
AGS 14.8
EGL 14.9
Culet
GIA N
AGS P
EGL N
No 8
Total Depth %
GIA 61.5
AGS 61.2
EGL 61.9
Table %
GIA 57
AGS 57
EGL 57
Girdle
GIA Thn
-
Med
F
AGS 0.7%
-
1.5%
F
EGL 0.7%
-
1.3%
Diameter Min (mm)
GIA 5.48
AGS 5.5
EGL 5.47
Diameter Max (mm)
GIA 5.51
AGS 5.52
EGL 5.51
Total Depth (mm)
GIA 3.38
AGS 3.37
EGL 3.39
Pavilion Angle
AGS 41.1
EGL 41.2
Pavilion Depth %
AGS 43.4
EGL 43.8
Crown Angle
AGS 34.2
EGL 34.4
Crown Height %
AGS 14.5
EGL 14.8
Culet
GIA N
AGS P
EGL N
No 9
Total Depth %
GIA 60.9
AGS 60.8
EGL 61.1
Table %
GIA 57
AGS 57
EGL 57
Girdle
GIA Thn


F
AGS 0.7%
-
1.2%
F
EGL Thn


F
Diameter Min (mm)
GIA 5.78
AGS 5.79
EGL 5.76
Diameter Max (mm)
GIA 5.81
AGS 5.82
EGL 5.8
Total Depth (mm)
GIA 3.53
AGS 3.53
EGL 3.54
Pavilion Angle
AGS 41
EGL  
Pavilion Depth %
AGS 43.2
EGL 43.5
Crown Angle
AGS 34.1
EGL  
Crown Height %
AGS 14.5
EGL 14.7
Culet
GIA N
AGS P
EGL N
No 10
Total Depth %
GIA 61.8
AGS  
EGL 62
Table %
GIA 56/57
AGS  
EGL 56
Girdle
GIA Med
-
S.Thk
F
AGS  
EGL Thn
-
Med
F
Diameter Min (mm)
GIA 5.67
AGS  
EGL 5.65
Diameter Max (mm)
GIA 5.69
AGS  
EGL 5.67
Total Depth (mm)
GIA 3.51
AGS
EGL 3.51
Pavilion Angle
AGS
EGL  
Pavilion Depth %
AGS  
EGL 42.8
Crown Angle
AGS  
EGL  
Crown Height %
AGS  
EGL 14.8
Culet
GIA N
AGS  
EGL N
No 11
Total Depth %
GIA 63.0
AGS 63.0
EGL 63.3
Table %
GIA 59
AGS 59
EGL 59
Girdle
GIA S.Thk


F
AGS S.Thk


F
EGL S.Thk


F
Diameter Min (mm)
GIA 5.86
AGS 5.87
EGL 5.85
Diameter Max (mm)
GIA 5.92
AGS 5.92
EGL 5.91
Total Depth (mm)
GIA 3.71
AGS 3.71
EGL 3.72
Pavilion Angle
AGS 41.8
EGL  
Pavilion Depth %
AGS 44.3
EGL 44.6
Crown Angle
AGS 35.9
EGL  
Crown Height %
AGS 14.8
EGL 14.8
Culet
GIA N
AGS P
EGL N
No 12
Total Depth %
GIA 62.8
AGS 63.4
EGL 63.3
Table %
GIA 58
AGS 58
EGL 58
Girdle
GIA Thn
-
Thk
F
AGS Thn
-
Thk
F
EGL X.Thn
-
S.Thk
F
Diameter Min (mm)
GIA 5.63
AGS 5.62
EGL 5.60
Diameter Max (mm)
GIA 5.70
AGS 5.69
EGL 5.67
Total Depth (mm)
GIA 3.56
AGS 3.58
EGL 3.57
Pavilion Angle
AGS 41.2
EGL  
Pavilion Depth %
AGS 43.4
EGL 43.4
Crown Angle
AGS 37.2
EGL  
Crown Height %
AGS 15.8
EGL 16.0
Culet
GIA N
AGS P
EGL N
No 13
Total Depth %
GIA 61.5
AGS 61.6
EGL 61.8
Table %
GIA 60
AGS 60
EGL 60
Girdle
GIA Med
-
S.Thk
AGS Med
-
Thk
EGL Med
-
S.Thk
SF
Diameter Min (mm)
GIA 5.79
AGS 5.79
EGL 5.77
Diameter Max (mm)
GIA 5.85
AGS 5.87
EGL 5.88
Total Depth (mm)
GIA 3.58
AGS 3.59
EGL 3.59
Pavilion Angle
AGS 41.5
EGL  
Pavilion Depth %
AGS 43.9
EGL 44.1
Crown Angle
AGS 34.3
EGL  
Crown Height %
AGS 13.7
EGL 13.9
Culet
GIA N
AGS P
EGL N
No 14
Total Depth %
GIA 60.4
AGS 60.8
EGL 60.8
Table %
GIA 56
AGS 55
EGL 56
Girdle
GIA Thn
AGS Thn
EGL Thn
Diameter Min (mm)
GIA 6.79
AGS 6.79
EGL 6.77
Diameter Max (mm)
GIA 6.82
AGS 6.80
EGL 6.81
Total Depth (mm)
GIA 4.11
AGS 4.13
EGL 4.12
Pavilion Angle
AGS 40.9
EGL  
Pavilion Depth %
AGS 43.2
EGL 43.2
Crown Angle
AGS 34.9
EGL  
Crown Height %
AGS 15.5
EGL 15.5
Culet
GIA N
AGS P
EGL N
No 15
Total Depth %
GIA 61.2
AGS 61.4
EGL 61.5
Table %
GIA 54
AGS 54
EGL 53
Girdle
GIA Med
AGS Thn
-
Med
EGL Med
-
S.Thk
Diameter Min (mm)
GIA 6.50
AGS 6.50
EGL 6.49
Diameter Max (mm)
GIA 6.60
AGS 6.59
EGL 6.59
Total Depth (mm)
GIA 4.01
AGS 4.02
EGL 4.02
Pavilion Angle
AGS 41.1
EGL  
Pavilion Depth %
AGS 43.4
EGL 43.6
Crown Angle
AGS 33.7
EGL  
Crown Height %
AGS 15.3
EGL 15.4
Culet
GIA N
AGS P
EGL N
No 16
Total Depth %
GIA 56.9
AGS 57.3
EGL 57.4
Table %
GIA 62
AGS 61
EGL 62
Girdle
GIA Thn
-
Med
F
AGS Thn
-
Med
F
EGL Thn
-
Med
F
Diameter Min (mm)
GIA 7.15
AGS 7.14
EGL 7.13
Diameter Max (mm)
GIA 7.19
AGS 7.18
EGL 7.16
Total Depth (mm)
GIA 4.08
AGS 4.10
EGL 4.10
Pavilion Angle
AGS 41.1
EGL  
Pavilion Depth %
AGS 43.4
EGL 43.7
Crown Angle
AGS 29.7
EGL  
Crown Height %
AGS 11.0
EGL 10.9
Culet
GIA N
AGS P
EGL N
No 17
Total Depth %
GIA 63.0
AGS 63.4
EGL 63.5
Table %
GIA 54
AGS 54
EGL 54
Girdle
GIA Med
-
Thk
F
AGS S.Thk
-
Thk, F
EGL S.Thk
-
Thk
F
Diameter Min (mm)
GIA 5.62
AGS 5.62
EGL 5.61
Diameter Max (mm)
GIA 5.65
AGS 5.65
EGL 5.66
Total Depth (mm)
GIA 3.55
AGS 3.57
EGL 3.57
Pavilion Angle
AGS 40.9
EGL  
Pavilion Depth %
AGS 43.2
EGL 43.2
Crown Angle
AGS 34.7
EGL  
Crown Height %
AGS 15.8
EGL 16.0
Culet
GIA N
AGS P
EGL N

Abbreviations
Girdle
X.Thn - Extremely Thin
V.Thn - Very Thin
Thn - Thin
Med - Medium
S.Thk - Slightly Thick
Thk - Thick
F - Faceted
Culet
N - None
P - Pointed

 

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