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                                  AGA Accredited Gem Appraisers Cut Grading Chart for Emerald & Radiant Cut

 

  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 % 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 %

Word description and percentages

Very Thin to Slightly Thick, 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 7.0%

Ext.Thin to Ext.Thick

0% to > 7.0%
Total Depth %

Determined by factors already considered above		 60-65% 65.1-69.0%
58-59.9%		 69.1-74.0%
57-57.9%		 74.1-78.0%
56-56.9%		 78.1-80%
53-55.9%		 > 80%
< 53%
Polish/Symmetry
Not a primary determining factor		 Excellent to Good Good or Fair Fair to Poor
Square range
Length/Width ratios (Preferences only)		 0.95-1.05
Rectangular range
Length/Width ratios (Preferences only)		 1.5-1.75 1.49-1.06
1.76-1.99

> Class 3

< Class 3

                         

                          AGA Cut Grading Charts for

                          Round Brilliant Cut  

                          Princess Cut  

                          Pear, Heart, Oval and Marquise                           

                                                                                                   Back to Cut Info

 

 

 

 
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