AGS Diamond Proportion Chart - The Ross Jewelry Company

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American Gem Society Diamond Proportion Chart | AGS Diamond Proportion Chart

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AGS Diamond Proportions Chart

AGS Diamond Proportions Charts

The AGS Laboratories diamond graders consider the following factors when evaluating Proportions: Pavilion Angle, Table Size, Crown Angle, Girdle Thickness, Culet Size.

Pavillion Depth - Table Diameter - Crown Angle

Average Pavilion Depth
Percentage
AGS Grade Average Table Diameter
Percentage
AGS Grade Crown Angle
Degrees
AGS Grade
39.4 or less 10 46.3 and smaller 10 28.3 or 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 or greater 10 71.6-73.5 8 37.9-38.3 5
    73.6-75.5 9 38.4-38.8 6
    75.6 or greater 10 38.9-39.3 7
        39.4-39.8 8
        39.9 or greater 9, 10

Polish & Symmetry - Girdle Thickness - Culet Size

Polish and Symmetry Characteristics AGS Grade Girdle Thickness 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        

While you are shopping for your diamond, if the sales person helping you is unable to explain "diamond proportions" to you so that you understand it clearly . . . thank them for any time spent with you . . . and leave.  If you don't know how a diamond's proportions effect its price and beauty, you don't have the entire picture.

If you have any questions about diamond proportions, diamond cut, ideal cut diamonds, or diamonds in general . . . please do not hesitate to call us.  We will answer each of your questions and then we will help you select a beautifully cut diamond for less than from virtually any other source . . . including the internet.


AGS Proportion Chart - The Ross Jewelry Company
The Ross Jewelry Company - 5 Piedmont Center, Suite 110 - Atlanta, Georgia 30305 - (404) 495-3720

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