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Diamond Proportions

Original jewelry care kit


Diamond Shapes | Diamond Weight | Diamond Proportions | Diamond Color | Diamond Clarity
Interesting Diamonds facts

Pear, Heart, Oval, Marquise Diamond Proportions Chart

  Ideal Cut Premium Cut International Fine Trade Cut US domestic Average Cut Below Average Cut
Cut classes Class 1A Class 1B Class 2A Class 2B Class 3A Class 3B Class 4A Class 4B
Table, % 57-60Original Diamonds 60.1-61.5Original Diamonds
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, % 13-14.5Original Diamonds 12.9-12.5Original Diamonds
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 Thikness, %

Word description and percentages
Thin to Medium or Medium to Thick 1% to 3.0% or 1.7% to 5.5%Original Diamonds 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, %

Determined by factors already considered above
59.0-63.0Original Diamonds 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 ratio
Trade Preferences. A matter of personal taste and choice.
Pear 1.50-1.75Original Diamonds
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 GoodOriginal Diamonds Good or Fair Poor

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