Asscher Cut Diamonds - Square Emerald Cut Diamonds

Princess shape diamond

A Square Emerald or "Asscher" cut is a step cut with angled corners and rows of pavilion and crown facets that run parallel to the girdle.   “Asscher” is a term often used in the marketplace to describe these square Emerald cuts.  The term is derived from the Asscher family name.  The Royal Asscher Diamond Company currently produces the “Royal Asscher” cut, which is a patented square step cut with an extra row of facets on top and bottom, a notable high crown, and 74 total facets. http://www.asscher.nl/ Optimal length to width ratio for Square Emerald cuts is .95 to 1.05.

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

Special Characteristics of Asscher or Square Emerald Cut Diamonds

It is easier to see inclusions in step 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

Square Emerald cuts will generally look smaller from the “face up” position than other shapes of the same carat weight.  This is a result of their different design and while depth is not strictly tied to spread (as it is with rounds) square emeralds may have greater total depth as a result of optimized angles for light return (good) or pavilion “bulge” (bad).

Basic Asscher Cut Guidelines courtesy of http://www.gemappraisers.com/index.asp

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

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

Asscher Cut Diamonds posted on Pricescope

Asscher Cut Diamond by Starryeyed   Asscher Cut Diamond by Lablett

Posted by Starryeyed                                                        Posted by Lablett

Asscher Cut Diamond by LaurenThePartier  Asscher cut Diamond by Lovey2

Posted by LaurenThePartier                                            Posted by Lovey2

Threads with pictures of Asscher 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 Asscher Cuts

http://www.pricescope.com/forum/rockytalky/helpful-threads-archive-t49297.html

Intensive Asscher Cut Journal Discussion

Performance and the p3 facets, a discussion about step cut diamonds.
 
Next Diamond Tutorial: Cushion Cut Diamonds »
 
Discuss square emerald cut diamonds on the forum