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Home > Diamond Education > Cut > Proportions Charts >


Proportions charts for Emerald & Radiant Cut

  Ideal Cut Premium Cut International Fine Trade Cut US domestic Average Cut Below Average Cut
Cut classes Class 1A Class 1B Class 2A Class 2B Class 3A Class 3B Class 4A Class 4B
Table, % 61-63.5 63.6-64.1
60.9-60
64.2-65.0
59.9-59.0
65.1-69.0
58.9-58
69.1-74.0
57.9-56.0
74.1-76.0
55.9-53.0
76.1-78.0
52.9-50.0
> 78.0
< 50.0
Crown height, % 12.3-14.4 12.2-11.9
14.5-15
11.8-11.5
15.1-15.5
11.4-11.1
15.6-16.2
11.0-9.5
16.3-17.0
9.4-8.5
17.1-18.5
8.4-7.8
18.6-19.5
< 7.8%
> 19.5
Girdle Thikness, %

Word description and percentages
Thin to Medium or Medium to Thick 1% to 3.0% or 1.7% to 5.5% Thin to Thick 1% to 5.5% > more variance Very thin to Very thick 0.4% to 7.0% Extremely thin to Extremely thick 0% to > 7.0%
Total Depth, %

Determined by factors already considered above
60-65 65.1-69.0
59.9-58.0
69.1-74.0
57.9-57.0
74.1-78.0
56.9-56.0
78.1-80.0
55.9-53.0
> 80.0%
< 53.0%
Polish/Symmetry
Not a primary determining factor
Excellent to Good Good or Fair Poor
Square range
Length/Width ratios (Preferences only)
0.95-1.05
Rectangular range
Length/Width ratios (Preferences only)
1.5-1.75 1.49-1.26
1.76-1.99
> Class 3 <
Class 3