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 %

55-60%

53-61.5%

52-62%

51-64%

51-67%

49-70%

48-72%

>72%
<48%

Crown Height %

12-15%

11.5-16%

11-16.6%

10.1-17.5%

9-18%

8.3-18.9%

7.8-19.5%

<7.8%
>19.5%

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 %

59.0-63.0%

63.1-65.4%

56-68.5%

46-71%

43-73%

>73%
< 43%

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 to Fair