CUT CLASSES

Class 1A

Class 1B

Class 2A

Class 2B

Class 3A

Class 3B

Class 4A

Class 4B

Ideal cut

Premium 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

1.26-1.99

> Class 3 < Class 3

Marquise 1.75-2.25

1.51-2.49

> Class 3 < Class 3

Heart 0.98-1.02

1.24-0.91

> Class 3 < Class 3

Oval 1.33-1.66

1.26-1.74

> Class 3 < Class 3

Polish/Symmetry

Not a primary determining factor.

Excellent to Good

Good to Fair

Fair to Poor