Emerald & Radiant Cuts Chart

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

Courtesy of D.S. Atlas, Accredited Gem Appraisers, © AGA 1998-2004



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