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                                                     AGA Accredited Gem Appraisers Cut Grading Chart for Round Brilliant Cut

 

  Hearts & Arrows Ideal Cut American Ideal Cut International Fine Trade Cut US domestic Average Cut Below Average Cut
Cut Classes Visual Pattern Class 1A Class 1B Class 2A Class 2B Class 3A Class 3B Class 4A Class 4B

Table %

53%-63% are weight

specific in 1A, 1B, 2A

grades

 < 0.49ct <0.49ct < 0.49ct < 0.49ct all weights all weights all weights all weights all weights
53-57.5% 53-59% 59.1-62%
52-52.9%		 62.1-63%
51.5-51.9%		 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%
> 0.50ct > 0.50ct > 0.50ct > 0.50ct
53-58% 58.1-60%
52-52.9%		 60.1-63%
51.5-51.9%
Crown Angle ° 34.3-34.7° 34-34.2°
34.8-35°		 32.1-33.9°
35.1-35.8°		 31.6-32°
35.9-36.4°		 31.5-30.1°
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 < 0.49ct all weights all weights all weights all weights all weights
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%		 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%		 11.6-13.45%
or
16.9-17.9%
Pavilion 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%
46.1-48%		 <38%
>48%
Girdle Thickness %

Word description and percentages		 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%		 Ext. Thin to Extr. Thick
0-7%
Total Depth %

Determined by factors already considered above		 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%		 57-57.49%
63.81-64.1%		 56.5-56.99%
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 Cut Grading Charts for

          Princess Cut  

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          Emerald & Radiant Cut

 

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