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 %

62%-68%

60%-72%

59%-74%

58%-78%

56%-82%

53%-85%

50%-88%

>88%
<50%

Crown Height %

10-15%

8.5-16%

8-16.9%

6-18%

5-19%

4-19.9%

3-20.9%

<3%
>21%

Girdle thickness
Word descriptions and percentages.

Very Thin to Slightly Thick
(0.4%-4.5%) or
Thin to Thick (1.0%-5.5%)

Very Thin
to Thick
(0.4-5.5%)

Very Thin to
Very Thick
(0.4%-7%)

Extremely thin to
Extremely thick
(0% to > 7%)

Total Depth %

64%-75%

58%-80%

57%-83%

56%-84%

53%-85%

>85%
< 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

1.49-1.06
1.76-1.99

> Class 3 < Class3