AGS Diamond Proportion Chart

Click here for the best links on the Web to learn about jewelry

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.

The Ross Jewelry Company - 7 Piedmont Center, Suite 104 - Atlanta, Georgia - (404) 495-3720

We are proud members of the following jewelry industry organizations:

Click here to return to Ross Jewelry Company's Home Page

Please bookmark this page for continuing reference and please refer our website to others.
Also click on the Register link above to learn how you can benefit from exceptional price and availability opportunities.