|
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 % |
57-60% |
60.1-61.5%
56.9-54% |
61.6-62%
53.9-53% |
62.1-64.0%
52.9-52% |
64.1-67.0%
51.9-51.0% |
67.1-70.0%
50.9-50% |
70.1-72.0
49.9-49% |
> 72.0%
< 49.0% |
|
Crown Height |
13-14.5% |
12.9-12.5%
14.6-15% |
12.4-12%
15.1-15.6% |
11.9-11.1%
15.7-16.5% |
11.0-9.7%
16.6-17.3% |
9.6-8.7%
17.4-18.4% |
8.6-7.8%
18.5-19.5% |
< 7.8%
> 19.5% |
Girdle thickness
Word descriptions and percentages. |
Thin to Medium or
Medium to Thick
1% to 3.0%
1.7% to 5.5% |
Thin to Thick
1% to 5.5%
more variance
allowed |
Very thin to
Very thick
0.4% to 7.0% |
Extremely thin to
Extremely thick
0% to > 7.0% |
|
Total Depth % |
59.0-63.0% |
63.1-65.4%
58.9-58.0% |
65.5-68.5%
57.9-56.0% |
68.6-71.0%
55.9-46.0% |
71.1-73.0%
45.9-43.0% |
> 73.0%
< 43.0% |
Length:Width Ratios
Trade preferences.
A matter of personal taste and choice. |
Pear 1.50-1.75
Marquise 1.75-2.25
Heart 0.98-1.02
Oval 1.33-1.66 |
1.26-1.99
1.51-2.49
1.24-0.91
1.26-1.74 |
> Class 3 < Class 3
|
Polish/Symmetry
Not a primary determining factor. |
Excellent to Good |
Good or Fair |
Poor |