| CUT
CLASSES |
Class1A |
Class1B |
Class
2A |
Class
2B |
Class
3A |
Class
3B |
Class
4A |
Class
4B |
| |
American
Ideal Cut |
International
fine trade cut
|
US
domestic average cut
|
below
average
|
| Table
%
53%-63%
are weight specific in 1A,1B,2A grades |
<
.49ct
53-59%
>
.50ct
53-58% |
<
.49ct
59.1-62%
52.9-52%
>.50ct
58.1-60%
52.9-52% |
<
.49ct
62.1-63.0%
51.9-51.5%
>.50ct
60.1-63%
51.9-51.5% |
all
weights
63.1-64.0%
51.4-51.0% |
all
weights
64.1-67.0%
50.9-50.5% |
all
weights
67.1-70.0%
50.4-50.0% |
all
weights
70.1-72.0%
49.9-49.0% |
all
weights
>
72%
<
49% |
| Crown
angle° |
34.3-34.7 |
34.0-34.2
34.8-35.0 |
33.9-32.1
35.1-35.8 |
32.0-31.6
35.9-36.4 |
31.5-30.1
36.5-37.9 |
30.0-29.6
38.0-39.4 |
29.5-29.0
39.5-40.5 |
<
29.0
>
40.5 |
|
Crown
height % |
<
.49ct
14.0-16.3%
> .50ct
14.3-16.3% |
<
.49ct
13.9-12.8%
or
16.4-16.8%
> .50ct
14.2-13.5%
or
16.4-16.8% |
<.49ct
12.7-11.6%
or 16.9-17.9%
> .50ct
13.4-11.6%
or 16.9-17.9% |
all
weights
11.5-11.1%
or
18.0-18.1% |
all
weights
11.0-9.6%
or
18.2-19.3% |
all
weights
9.5-8.5%
or
19.4-20.5% |
all
weights
8.4-7.8%
or
20.6-21.8% |
all
weights
< 7.8%
or
> 21.8% |
| Pavilion
Depth % |
42.8-43.2% |
42.7-42.5%
43.3-43.5% |
42.4-42.0.%
43.6-44.0% |
41.9%-41.5%
44.1%-44.9% |
41.4-41.0%
45.0-45.5% |
40.9-40.5%
45.6-46.0% |
40.4-38.0%
46.1-48.0% |
<
38.0%
>
48.0% |
| Girdle
Thickness:
Word descriptions
and percentages. |
Medium
1.7%-3% |
sl.
thin to sl. thick
1.5%-4.5% |
thin
to sl.thick
1.0%-4.5% |
thin
to thick
1.0%-5.5% |
very
thin to very thick
0.4%-7.0% |
ext.
thin to ext. thick
0%->7.0% |
| Total
depth %
Determined
by factors already considered above |
58.7-62.3%
limiting
range |
58.69-58.3%
62.31-62.99%
limiting
ranges |
58.29-57.9%
63.0-63.5%
|
57.89-57.5%
63.51-63.8%
|
57.49-57.0%
63.81-64.1%
|
56.99-56.5%
64.11-65.0% |
56.49-55.0%
65.01-67.0%
|
<
55.0%
>
67.0%
|
| |
|
Polish/Symmetry
NOT A
PRIMARY DETERMINING FACTOR |
Excellent
or
Very
Good
|
Excellent
to
Good
|
Good
or
Fair
|
Poor
|
