Emerald & Radiant Cuts Chart

Published on: April 8th, 2009

CUT CLASSES	Class 1A	Class 1B	Class 2A	Class 2B	Class 3A	Class 3B	Class 4A	Class 4B
	Ideal cut	Premium cut	International fine trade cut		US domestic average cut		below average
Table %	60-65.5%	59-68%	58-69.5%	57-72%	56-74%	53-76.%	50-78.%	>78% <50%
Crown Height %	12-15.%	11-16%	10-16.5%	9-17.2%	8-18.0%	7-19.5%	6-20.5%	<6% >20.5%
Girdle thickness Word descriptions and percentages.	V. Thin to Sl. Thick (0.4%-4.5%) or Thin to Thick (1%-5.5%)			V.Thin to Thick(0.4%-5.5%)	Very Thin to Very Thick (0.4% to 7.0%)		Extremely thin to Extremely thick (0.0% to >7.0%)
Total Depth %	60-65%			58-69%	57-74%	56-78%	53-80%	>80% <53%
Polish/Symmetry Not a primary determining factor.	Excellent to Good			Good or Fair			Poor to Fair
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

CUT CLASSES	Class 1A
	Ideal cut
Table %	60-65.5%
Crown Height %	12-15.%
Girdle thickness Word descriptions and percentages.	V. Thin to Sl. Thick (0.4%-4.5%) or Thin to Thick (1%-5.5%)
Total Depth %	60-65%
Polish/Symmetry Not a primary determining factor.	Excellent to Good
Square range Length : Width ratios Preferences only	0.95-1.05
Rectangular range Length : Width ratios Preferences only	1.5-1.75
CUT CLASSES	Class 1B
	Premium cut
Table %	59-68%
Crown Height %	11-16%
Girdle thickness Word descriptions and percentages.	V. Thin to Sl. Thick (0.4%-4.5%) or Thin to Thick (1%-5.5%)
Total Depth %	60-65%
Polish/Symmetry Not a primary determining factor.	Excellent to Good
Square range Length : Width ratios Preferences only	0.95-1.05
Rectangular range Length : Width ratios Preferences only	1.5-1.75
CUT CLASSES	Class 2A
	International fine trade cut
Table %	58-69.5%
Crown Height %	10-16.5%
Girdle thickness Word descriptions and percentages.	V. Thin to Sl. Thick (0.4%-4.5%) or Thin to Thick (1%-5.5%)
Total Depth %	60-65%
Polish/Symmetry Not a primary determining factor.	Excellent to Good
Square range Length : Width ratios Preferences only	0.95-1.05
Rectangular range Length : Width ratios Preferences only	1.5-1.75
CUT CLASSES	Class 2B
	International fine trade cut
Table %	57-72%
Crown Height %	9-17.2%
Girdle thickness Word descriptions and percentages.	V.Thin to Thick(0.4%-5.5%)
Total Depth %	58-69%
Polish/Symmetry Not a primary determining factor.	Good or Fair
Square range Length : Width ratios Preferences only	0.95-1.05
Rectangular range Length : Width ratios Preferences only	1.49-1.26 1.76-1.99
CUT CLASSES	Class 3A
	US domestic average cut
Table %	56-74%
Crown Height %	8-18.0%
Girdle thickness Word descriptions and percentages.	Very Thin to Very Thick (0.4% to 7.0%)
Total Depth %	57-74%
Polish/Symmetry Not a primary determining factor.	Good or Fair
Square range Length : Width ratios Preferences only	0.95-1.05
Rectangular range Length : Width ratios Preferences only	1.49-1.26 1.76-1.99
CUT CLASSES	Class 3B
	US domestic average cut
Table %	53-76.%
Crown Height %	7-19.5%
Girdle thickness Word descriptions and percentages.	Very Thin to Very Thick (0.4% to 7.0%)
Total Depth %	56-78%
Polish/Symmetry Not a primary determining factor.	Good or Fair
Square range Length : Width ratios Preferences only	0.95-1.05
Rectangular range Length : Width ratios Preferences only	1.49-1.26 1.76-1.99
CUT CLASSES	Class 4A
	below average
Table %	50-78.%
Crown Height %	6-20.5%
Girdle thickness Word descriptions and percentages.	Extremely thin to Extremely thick (0.0% to >7.0%)
Total Depth %	53-80%
Polish/Symmetry Not a primary determining factor.	Poor to Fair
Square range Length : Width ratios Preferences only	0.95-1.05
Rectangular range Length : Width ratios Preferences only	> Class 3 < Class 3
CUT CLASSES	Class 4B
	below average
Table %	>78% <50%
Crown Height %	<6% >20.5%
Girdle thickness Word descriptions and percentages.	Extremely thin to Extremely thick (0.0% to >7.0%)
Total Depth %	>80% <53%
Polish/Symmetry Not a primary determining factor.	Poor to Fair
Square range Length : Width ratios Preferences only	0.95-1.05
Rectangular range Length : Width ratios Preferences only	> Class 3 < Class 3