• Hearts & Arrows Ideal Cut
• American Ideal Cut
• International Fine Trade Cut
• American Average Cut or Average Cut
• Below Average Cut
• AGA Round Diamond Proportions chart
• AGA Princess Diamond Proportions chart
• AGA Pear, Heart, Oval, Marquise Diamond Proportions Chart
• AGA Emerald & Radiant Diamond Proportions Chart
• Marcel Tolkowsky
• AGS Proportions Charts for Brilliant Cut

Diamond Shapes | Diamond Weight | Diamond Proportions | Diamond Color | Diamond Clarity
Interesting Diamonds facts

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	Phenomenon	Class 1A	Class 1B	Class 2A	Class 2B	Class 3A	Class 3B	Class 4A	Class 4B
Table, % 53%-63% are weght specific in 1A, 1B, 2A grades	<=.49ct	<=.49ct	<=.49ct	<=.49ct	all weights	all weights	all weights	all weights	all weights
	53-57.5	53-59	59.1-62 52.9-52	62.1-63 51.9-51.5	63.1-64 51.4-51	64.1-67 50.9-50.5	67.1-70 50.4-50	70.1-72 49.9-49	>72 <49
	>=.50ct	>=.50ct	>=.50ct	>=.50ct
	53-58	53-58	58.1-60 52.9-52	60.1-63 51.9-51.5
Crown angle, °	34.3-34.7	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, %	<=.49ct	<=.49ct	<=.49ct	<=.49ct	all weights	all weights	all weights	all weights	all weights
	14-16.3	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
	>=.50ct	>=.50ct	>=.50ct	>=.50ct
	14.3-16.3	14.3-16.3	13.5-14.2 or 16.4-16.8	11.6-13.4 or 16.9-17.9
Pavilion Depth, %	42.8-43.2	42.8-43.2	42.5-42.7 43.3-43.5	42-42.4 43.6-44	41.5-49 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 Thikness, % Word description and percentages	Thin, Medium, Slightly thick 1.7-3		Slightly thin to slightly thick 1.5-4.5	Thin to slightly thick 1-4.5	Thin to thick 1-5.5	Very thin to very thick 0.4-7		Extra thin to extra 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	57-57.46 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

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