Radiant Cut Diamonds
Square or Rectangular Cut Cornered Modified Brilliant
Radiant cuts are square or rectangular mixed cuts with angled
corners. Henry Grossbard patented the Radiant cut in the late 1970s,
as a brilliant alternative to the Emerald cut. Radiant cuts are often
utilized to maximize color in fancy colored diamonds. The nature of
this cut aids in the concentration of color, and will sometimes push a
light yellow diamond in the S-Z range into the fancy yellow category.
Radiants are categorized as Cut Cornered Modified Brilliant cuts by
major diamond grading labs.
**Visit Radiant Cut Diamond Prices for the latest retail diamond price statistics.
Special Characteristics of Radiant Cut Diamonds
Because of the angled corners, Radiant cuts lack the setting issues
of sharply cornered Princess cuts, which require extra care.
Size Matters
Like Princess cuts, Radiant cuts generally look smaller from the
“face up” position than other diamond shapes of the same weight as a
result of their different design.
Basic Radiant Cut Guidelines courtesy of http://datlas.com/AGA_NAJA_Cut_Class_grader/index.php
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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 |
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Table % |
60-65.5% |
59-68% |
58-69.5% |
57-72% |
56-74% |
53-76.% |
50-78.% |
>78% |
Crown Height % |
12-15.% |
11-16% |
10-16.5% |
9-17.2% |
8-18.0% |
7-19.5% |
6-20.5% |
<6% |
Girdle thickness |
V. Thin to Sl. Thick |
V.Thin to Thick(0.4%-5.5%) |
Very Thin to Very Thick |
Extremely thin to |
||||
Total Depth % |
60-65% |
58-69% |
57-74% |
56-78% |
53-80% |
>80% |
||
Polish/Symmetry |
|
|
|
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Square range |
|
|||||||
Rectangular range |
1.5-1.75 |
1.49-1.26 |
> Class 3 < Class 3 |
CUT CLASSES |
Class 1A |
Ideal cut |
|
Table % |
60-65.5% |
Crown Height % |
12-15.% |
Girdle thickness |
V. Thin to Sl. Thick |
Total Depth % |
60-65% |
Polish/Symmetry |
|
Square range |
|
Rectangular range |
1.5-1.75 |
CUT CLASSES |
Class 1B |
Premium cut |
|
Table % |
59-68% |
Crown Height % |
11-16% |
Girdle thickness |
V. Thin to Sl. Thick |
Total Depth % |
60-65% |
Polish/Symmetry |
|
Square range |
|
Rectangular range |
1.5-1.75 |
CUT CLASSES |
Class 2A |
International fine trade cut |
|
Table % |
58-69.5% |
Crown Height % |
10-16.5% |
Girdle thickness |
V. Thin to Sl. Thick |
Total Depth % |
60-65% |
Polish/Symmetry |
|
Square range |
|
Rectangular range |
1.5-1.75 |
CUT CLASSES |
Class 2B |
International fine trade cut |
|
Table % |
57-72% |
Crown Height % |
9-17.2% |
Girdle thickness |
V.Thin to Thick(0.4%-5.5%) |
Total Depth % |
58-69% |
Polish/Symmetry |
|
Square range |
|
Rectangular range |
1.49-1.26 |
CUT CLASSES |
Class 3A |
US domestic average cut |
|
Table % |
56-74% |
Crown Height % |
8-18.0% |
Girdle thickness |
Very Thin to Very Thick |
Total Depth % |
57-74% |
Polish/Symmetry |
|
Square range |
|
Rectangular range |
1.49-1.26 |
CUT CLASSES |
Class 3B |
US domestic average cut |
|
Table % |
53-76.% |
Crown Height % |
7-19.5% |
Girdle thickness |
Very Thin to Very Thick |
Total Depth % |
56-78% |
Polish/Symmetry |
|
Square range |
|
Rectangular range |
1.49-1.26 |
CUT CLASSES |
Class 4A |
below average |
|
Table % |
50-78.% |
Crown Height % |
6-20.5% |
Girdle thickness |
Extremely thin to |
Total Depth % |
53-80% |
Polish/Symmetry |
|
Square range |
|
Rectangular range |
> Class 3 < Class 3 |
CUT CLASSES |
Class 4B |
below average |
|
Table % |
>78% |
Crown Height % |
<6% |
Girdle thickness |
Extremely thin to |
Total Depth % |
>80% |
Polish/Symmetry |
|
Square range |
|
Rectangular range |
> Class 3 < Class 3 |
Courtesy of D.S. Atlas, Accredited Gem Appraisers, © AGA 1998-2004
Radiant Cuts posted on Pricescope
Threads with pictures of Radiant Cuts
https://www.pricescope.com/forum/rockytalky/helpful-threads-archive-t20713.html
https://www.pricescope.com/forum/rockytalky/helpful-threads-archive-t88394.html
Thread discussing Radiant Cut Quality
https://www.pricescope.com/forum/rockytalky/helpful-threads-archive-t36357.html
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