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AGA Accredited Gem Appraisers Cut Grading Chart for Pear, Heart, Oval and Marquise
| 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 % | 55-60% | 60.1-61.5% 53-54.9% |
61.6-62% 52-59% |
62.1-64.0% 51.51.9% |
64.1-67.0% 50-50.9% |
67.1-70.0% 49-49.9% |
70.1-72.0% 48-48.9% |
> 72.0% < 48.0% |
| 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 % Word description and percentages |
Very Thin to Slightly Thick, Thin to Thick 0.4%to 4.5% or 1% to5.5% |
Very Thin to Thick 0.4% to 5.5% |
Very Thin to Very Thick 0.4% to 7.0% |
Extremely Thin to Extremely Thick 0% to > 7.0% |
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| 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 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 |
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| Polish/Symmetry Not a primary determining factor |
Excellent to Good | Good to Fair | Fair to Poor | |||||
AGA Cut Grading Charts for
Princess Cut Back to Cut Info
Emerald & Radiant Cut
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