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Home > Diamond Education > Cut > Proportions Charts >


AGS proportions charts for Brilliant Cut

Average Pavilion Depth, % AGS Grade Average Table Diameter, % AGS Grade Crown Angle in degrees AGS Grade
39,4 and less 10 46.3 and smaller 10 28.3 and less 10
39.5-40.1 9 46.4-47.3 9 28.4-29.1 9
40.2-40.6 8 47.4-48.3 8 29.2-29.6 8
40.7-41.1 7 48.4-49.3 7 29.7-30.1 7
41.2-41.6 5 49.4-50.3 7 30.2-30.6 6
41.7-42.1 3 50.4-51.3 3 30.7-31.1 5
42.2-43.8 1 51.4-52.3 1 31.2-31.6 4
43.9-44.3 0 52.4-57.5 0 31.7-32.1 3
44.4-44.8 1 57.6-59.5 1 32.2-32.6 2
44.9-45.3 3 59.6-62.0 2 32.7-33.6 1
45.4-45.8 4 62.1-63.5 3 33.7-35.8 0
45.9-46.3 5 63.6-65.5 4 35.9-36.3 1
46.4-46.8 7 65.6-67.5 5 36.4-36.8 2
46.9-47.5 8 67.6-69.5 6 36.9-37.3 3
47.6-48.5 9 69.6-71.5 7 37.4-37.8 4
48.6+ 10 71.6-73.5 8 37.9-38.3 5
    73.6-75.5 9 38.4-38.8 6
    75.6+ 10 38.9-39.3 7
       10 39.4-39.8 8
       10 39.9 and greater 9, 10


Polish and Symmetry Characteristics AGS Grade Girdle Thikness AGS Grade Culet Size AGS Grade
Extremely Difficult 10x 0 Extremely Thin 3 None, Very small 0
Very Difficult 10x 1 Very Thin 1 Small, Medium, Slightly Large 1
Difficult 10x 2 Thin, Medium 0 Large 3
Easy 10x 3 Slightly Thick, Thick 2 Very Large 5
Very Easy 10x 4 Very Thick 5 Extremely Large 7-10
Obvious 10x 5 Extremely Thick 7-10    
Unaided Eye 6        
Easy Unaided Eye 7, 8        
Obvious Unaided Eye 9, 10