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Diamond Charts
Preferred Proportions Round Diamonds
| |
Ideal Proportions |
Acceptable |
| Depth Percentage: |
60.2% - 62.7% |
57.0% - 64.0% |
| Table Percentage: |
53% - 57.0% |
53.0% - 64.0% |
| Polish: |
Very Good to excellent |
Good to Very Good |
| Symmetry: |
Very Good to excellent |
Good to Very Good |
| Girdle: |
Thin to medium |
Thin to Thick |
| Culet: |
None to very small |
None to medium |
Preferred Proportions for Oval, Pear, Marquise, and Heart Shaped Diamonds
| |
Ideal Proportions |
| Depth Percentage: |
58.9% - 65.4% |
| Table Percentage: |
53% - 64% |
| Polish: |
Good to excellent |
| Symmetry: |
Good to excellent |
| Girdle: |
Thin to thick |
Preferred Proportions for Emerald and Radiant Cut Diamonds
| |
Ideal Proportions |
| Depth Percentage: |
59.9% - 69.0% |
| Table Percentage: |
59% - 69% |
| Polish: |
Good to excellent |
| Symmetry: |
Good to excellent |
| Girdle: |
Thin to thick |
Preferred Proportions for Princess Cut Diamonds
| |
Ideal Proportions |
| Depth Percentage: |
64.0% - 75.0% |
| Table Percentage: |
59% - 72% |
| Polish: |
Good to excellent |
| Symmetry: |
Good to excellent |
| Girdle: |
Thin to thick |
AGA Accredited Gem Appraisers Cut Grading Chart for Round Brilliant Cut Diamonds
| |
Hearts and Arrows |
American Ideal Cut |
International Fine Cut |
US Domestic Average Cut |
Below Average Cut |
| Cut Classes |
Hearts Arrows |
Class 1A |
Class 1B |
Class 2A |
Class 2B |
Class 3A |
Class 3B |
Class 4A |
Class 4B |
| Table % |
< 0.49ct |
< 0.49ct |
< 0.49ct |
< 0.49ct |
All Weight |
All Weight |
All Weight |
All Weight |
All Weight |
| 53-57% |
53-59% |
59.1-63% |
62.1%-63% |
63.1-64% 51-51.4% |
64.1-67% 50.5-50.9% |
67.1-70% 50-50.4% |
70.1-72% 49-49.9% |
>72% <49% |
| 53-63% are weight specific in 1A, 1B, 2A grades |
51.5-51.9% |
51.5-51.9% |
| > 0.50 |
> 0.50 |
> 0.50 |
> 0.50 |
| 53-58% |
34-34.2% 34.8-35% |
60.1-63% 51.5-51.9% |
| |
| Crown Angle ˚ |
34.3-24.7˚ |
34-34.2˚ 34.8-35˚ |
32.1-33.9˚ 35.1-35.8˚ |
31.6-32˚ 35-9-36.4˚ |
30.1-31.5˚ 36.5-37.9˚ |
29.6-30˚ 38-39.4˚ |
29-29.5˚ 39.5-40.5˚ |
<29 <40.5˚ |
| |
| Crown Height % |
< 0.49ct |
< 0.49ct |
< 0.49ct |
< 0.49 |
All Weight |
All Weight |
All Weight |
All Weight |
All Weight |
| 14-16.3% |
12.8-13.9% or 16.4-16.8% |
11.6-12.7% or 16.9-17.9% |
11.1-11.5% or 18.0-18.1% |
11.1-11.5% or 18.0-18.1% |
9.6-11% or 18.2-19.3% |
8.5-9.5% or 19.4-20.5% |
7.8-8.4 or 20.6-21.8% |
<7.8% or >21.8% |
| > 0.50ct |
> 0.50ct |
> 0.50ct |
> 0.50ct |
| 14.3 - 16.3% |
13.5-14.2% or 16.4-16.8% |
11.6-13.5% or 16.9-17.9% |
| Pavillion Depth % |
42.8 - 43.2% |
42.5-42.7 % 43.3-43.5% |
42-42.4% 43.6-44% |
41.5-41.9% 44.1-44.9% |
41-41.4% 45-45.5% |
40.5-40.9% 45.6-46% |
38-40.4% 46.1-46% |
<38% >48% |
| Girdle Thickness % |
Thin to Med, Med to Slightly Thick 1.7-3% |
Very Thin to Med, Thin to Slightly Thick 1.5-4.5% |
Very Thin to Slightly Thick 1-4.5% |
Very Thin to Thick 1-5.5% |
Very Thin to Very Thick 0.4-7% |
Extremely Thin to Extremely Thick 0-7% |
| Total Depth % |
58.7-62.3% |
58.7-62.3% |
58.3-58.69% 62.31-62.99% |
57.9-58.29% 63-63.5% |
57.5-57.89% 63.51-63.8% |
57-57.59% 63.81-64.1% |
58.5-56.99% 64.11-65% |
55-56.49% 65.1-67% |
<55% >67% |
| Polish / Symmetry |
Excellent |
Excellent or Very Good |
Excellent to Good |
Good or Fair |
Poor |
AGA Accredited Gem Appraisers Cut Grading Chart for Princess Cut Diamonds
| |
Ideal Cut |
Premium Cut |
International Fine Cut |
US Domestic Cut |
Below Average Cut |
| Cut Classes |
Class 1A |
Class 1B |
Class 2A |
Class 2B |
Class 3A |
Class 3B |
Class 4A |
Class 4B |
| Table % |
62 - 68% |
60 - 72% |
59 - 74% |
58 - 78% |
56 - 82% |
53 - 85% |
50 - 88% |
<50% >88% |
| Crown Height % |
10 - 15% |
8.5 - 16% |
8 - 16.9% |
6 - 19% |
5 - 19% |
4 - 19.9% |
3 - 20.9% |
<3% >20.9% |
| Girdle Thickness % |
Very Thin to Slightly Thick or Thin to Thick 0.4% to 3% or 1% to 5.5% |
Very Thin to Thick 0.4% to 5.5% |
Very Thin to Very Thick 0.4 to 7% |
Very Thin to Very Thick 0.45 to 7% |
Extremely Thin to Extremely Thick 0% to > 7% |
| Total Depth % |
64 - 75% |
58 - 80% |
57 - 83% |
56 - 84% |
83 - 85% |
<53% >85% |
| Polish / Symmetry |
Excellent to Good |
Good to Fair |
Fair to Poor |
AGA Accredited Gem Appraisers Cut Grading Chart for Radiant and Emerald Cut Diamonds
| |
Ideal Cut |
Premium Cut |
International Fine Cut |
US Domestic Cut |
Below Average Cut |
| Cut Classes |
Class 1A |
Class 1B |
Class 2A |
Class 2B |
Class 3A |
Class 3B |
Class 4A |
Class 4B |
| Table % |
60-65.5% |
65.6-68% 59-59.9% |
68.1-69.5% 58-58.9% |
69.6-72% 57-59% |
72.1-74% 56-59% |
74.1-76% 53-55.9% |
76.1-78% 50-52.9% |
> 78% < 50% |
| Crown Height % |
12.3 - 14.4% |
11.9-12.2% 14.5-15% |
11.5-11.8% 15.1-15.5% |
11.1-11.4% 15.6-16.2% |
9.5-11% 16.3-17% |
8.5-9.4% 17.1-18.5% |
7.8-8.4% 18.6-19.5% |
<7.8% >19.5% |
| Girdle Thickness % |
Very Thin to Slightly Thick or Thin to Thick 0.4% to 4.5% or 1% to 5.5% |
Very Thin to Thick 0.4 to 7% |
Very Thin to Very Thick 0.4 to 7% |
Extremely Thin to Extremely Thick 0% to > 7% |
| Total Depth % |
60 - 65% |
65.1-69% 58-59.9% |
69.1-74% 57-57.9% |
74.1-78% 56-56.9% |
78.1-80% 53-55.9% |
> 80% < 53% |
| Rectangular Range Length / Width Ratio |
1.5 - 1.75 |
1.49 - 1.06 1.76 - 1.99 |
> Class 3 < Class 3 |
| Square Range |
0.95 - 1.05 |
| Polish / Symmetry |
Excellent to Good |
Good to Fair |
Fair to Poor |
AGA Accredited Gem Appraisers Cut Grading Chart for Pear, Marquise, Heart and Oval Diamonds
| |
Ideal Cut |
Premium Cut |
International Fine Cut |
US Domestic Cut |
Below Average Cut |
| Cut Classes |
Class 1A |
Class 1B |
Class 2A |
Class 2B |
Class 3A |
Class 3B |
Class 4A |
Class 4B |
| Table % |
55-60% |
60.1-61.5% 53-54.9% |
61.6-62% 52-59% |
62.1-64% 51-51.9% |
64.1-67% 50-50.9% |
67.1-70% 49-49.9% |
70.1-72% 48-48.9% |
>72% <48% |
| Crown Height % |
13-14.5% |
12.5-12.9% 14.6-15% |
12-12.4% 15.1-15.6% |
11.1-11.9% 15.7-16.5% |
9.7-11% 16.6-17.3% |
8.7-9.6% 17.4-18.4% |
7.8-8.6% 18.5-19.5% |
<7.8% >19.5% |
| Girdle Thickness % |
Very Thin to Slightly Thick or Thin to Thick 0.4% to 4.5% or 1% to 5.5% |
Very Thin to Thick 0.4% to 5.5% |
Very Thin to Very Thick 0.4 to 7% |
Very Thin to Very Thick 0.4 to 7% |
Extremely Thin to Extremely Thick 0% to > 7% |
| Total Depth % |
59.0-63.0% |
63.1-65.4% 58-58.9% |
65.5-68.5% 56-57.9% |
68.6-71% 46-55.9% |
71.1-73% 43-45.9% |
>73.0% <43.0% |
| Length / Width Ratio |
Pear 1.50 - 1.75 Marquise 1.75 -2.25 Heart 0.98 - 1.02 Oval 1.33 - 1.66 |
Pear 1.26 - 1.99 Marquise 1.51 - 2.49 Heart 1.24 - 0.91 Oval 1.26 - 1.74 |
> Class 3 < Class 3 |
| Polish / Symmetry |
Excellent to Good |
Good to Fair |
Fair to Poor |
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