Emerald Cut Diamonds

Emerald shape diamond

The Emerald cut is a step cut with angled corners and rows of pavilion and crown facets that run parallel to the girdle.  The traditional Emerald cut is rectangular in shape.  Recommended length to width ratio for Emerald cuts is 1.50-1.75.  Emerald cuts are known for their understated elegance.

**Visit Emerald Cut Diamond Prices for the latest retail diamond price statistics.

Special Characteristics of Emerald Cut Diamonds

It is easier to see inclusions in Emerald cuts vs. brilliant cuts.   Optimally, a balanced and symmetrical stone with a table % that is smaller than the total depth % is recommended.  There are a myriad of combinations that can make for beautiful stones, but guided parameters are now available. 

Size Matters

Rectangular Emerald cuts that are not overly deep, that are within the recommended girdle thickness range may look larger from the “face up” position than princess cuts, radiant cuts, and round brilliants of the same carat weight.

Basic Emerald Cut Guidelines courtesy of http://datlas.com/AGA_NAJA_Cut_Class_grader/index.php

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


Emerald Cuts posted on Pricescope

Emerald Engagement ring posted by Darling         Emerald Engagement ring posted by Zhuzhu

Posted by Darling                                                           Posted by Zhuzhu

Emerald Engagement ring posted by Librarychickie      Emerald Engagement ring posted by EmeraldLover

Posted by Librarychickie                                              Posted by EmeraldLover


Threads with pictures of Emerald Cuts

http://www.pricescope.com/forum/rockytalky/helpful-threads-archive-t82527.html

http://www.pricescope.com/forum/rockytalky/helpful-threads-archive-t113993.html

Thread discussing Emerald Cut quality

http://www.pricescope.com/forum/rockytalky/helpful-threads-archive-t94650.html

Intensive Emerald Cut Journal Discussion

Performance and the p3 facets, a discussion about step cut diamonds
 
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