Diamond Charts

Preferred Proportions Round Diamonds

	Ideal Proportions	Acceptable
Depth Percentage:	60.2% - 62.7%	57.0% - 64.0%
Table Percentage:	53% - 57.0%	53.0% - 64.0%
Polish:	Very Good to excellent	Good to Very Good
Symmetry:	Very Good to excellent	Good to Very Good
Girdle:	Thin to medium	Thin to Thick
Culet:	None to very small	None to medium

Preferred Proportions for Oval, Pear, Marquise, and Heart Shaped Diamonds

	Ideal Proportions
Depth Percentage:	58.9% - 65.4%
Table Percentage:	53% - 64%
Polish:	Good to excellent
Symmetry:	Good to excellent
Girdle:	Thin to thick

Preferred Proportions for Emerald and Radiant Cut Diamonds

	Ideal Proportions
Depth Percentage:	59.9% - 69.0%
Table Percentage:	59% - 69%
Polish:	Good to excellent
Symmetry:	Good to excellent
Girdle:	Thin to thick

Preferred Proportions for Princess Cut Diamonds

	Ideal Proportions
Depth Percentage:	64.0% - 75.0%
Table Percentage:	59% - 72%
Polish:	Good to excellent
Symmetry:	Good to excellent
Girdle:	Thin to thick

AGA Accredited Gem Appraisers Cut Grading Chart for Round Brilliant Cut Diamonds

	Hearts and Arrows	American Ideal Cut		International Fine Cut		US Domestic Average Cut		Below Average Cut
Cut Classes	Hearts Arrows	Class 1A	Class 1B	Class 2A	Class 2B	Class 3A	Class 3B	Class 4A	Class 4B
Table %	< 0.49ct	< 0.49ct	< 0.49ct	< 0.49ct	All Weight	All Weight	All Weight	All Weight	All Weight
	53-57%	53-59%	59.1-63%	62.1%-63%	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%
53-63% are weight specific in 1A, 1B, 2A grades			51.5-51.9%	51.5-51.9%
	> 0.50	> 0.50	> 0.50	> 0.50
	53-58%		34-34.2% 34.8-35%	60.1-63% 51.5-51.9%

Crown Angle ˚	34.3-24.7˚		34-34.2˚ 34.8-35˚	32.1-33.9˚ 35.1-35.8˚	31.6-32˚ 35-9-36.4˚	30.1-31.5˚ 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	< 0.49	All Weight	All Weight	All Weight	All Weight	All Weight
	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%	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%	11.6-13.5% or 16.9-17.9%
Pavillion 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% 46.1-46%	<38% >48%
Girdle Thickness %	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%		Extremely Thin to Extremely Thick 0-7%
Total Depth %	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%	57-57.59% 63.81-64.1%	58.5-56.99% 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 Accredited Gem Appraisers Cut Grading Chart for Princess Cut Diamonds

	Ideal Cut	Premium Cut	International Fine Cut		US Domestic Cut		Below Average Cut
Cut Classes	Class 1A	Class 1B	Class 2A	Class 2B	Class 3A	Class 3B	Class 4A	Class 4B
Table %	62 - 68%	60 - 72%	59 - 74%	58 - 78%	56 - 82%	53 - 85%	50 - 88%	<50% >88%
Crown Height %	10 - 15%	8.5 - 16%	8 - 16.9%	6 - 19%	5 - 19%	4 - 19.9%	3 - 20.9%	<3% >20.9%
Girdle Thickness %	Very Thin to Slightly Thick or Thin to Thick 0.4% to 3% or 1% to 5.5%		Very Thin to Thick 0.4% to 5.5%	Very Thin to Very Thick 0.4 to 7%	Very Thin to Very Thick 0.45 to 7%		Extremely Thin to Extremely Thick 0% to > 7%
Total Depth %	64 - 75%			58 - 80%	57 - 83%	56 - 84%	83 - 85%	<53% >85%
Polish / Symmetry	Excellent to Good			Good to Fair			Fair to Poor

AGA Accredited Gem Appraisers Cut Grading Chart for Radiant and Emerald Cut Diamonds

	Ideal Cut	Premium Cut	International Fine Cut		US Domestic Cut		Below Average Cut
Cut Classes	Class 1A	Class 1B	Class 2A	Class 2B	Class 3A	Class 3B	Class 4A	Class 4B
Table %	60-65.5%	65.6-68% 59-59.9%	68.1-69.5% 58-58.9%	69.6-72% 57-59%	72.1-74% 56-59%	74.1-76% 53-55.9%	76.1-78% 50-52.9%	> 78% < 50%
Crown Height %	12.3 - 14.4%	11.9-12.2% 14.5-15%	11.5-11.8% 15.1-15.5%	11.1-11.4% 15.6-16.2%	9.5-11% 16.3-17%	8.5-9.4% 17.1-18.5%	7.8-8.4% 18.6-19.5%	<7.8% >19.5%
Girdle Thickness %	Very Thin to Slightly Thick or Thin to Thick 0.4% to 4.5% or 1% to 5.5%			Very Thin to Thick 0.4 to 7%	Very Thin to Very Thick 0.4 to 7%		Extremely Thin to Extremely Thick 0% to > 7%
Total Depth %	60 - 65%			65.1-69% 58-59.9%	69.1-74% 57-57.9%	74.1-78% 56-56.9%	78.1-80% 53-55.9%	> 80% < 53%
Rectangular Range Length / Width Ratio	1.5 - 1.75			1.49 - 1.06 1.76 - 1.99			> Class 3 < Class 3
Square Range	0.95 - 1.05
Polish / Symmetry	Excellent to Good			Good to Fair			Fair to Poor

AGA Accredited Gem Appraisers Cut Grading Chart for Pear, Marquise, Heart and Oval Diamonds

	Ideal Cut	Premium Cut	International Fine Cut		US Domestic Cut		Below Average Cut
Cut Classes	Class 1A	Class 1B	Class 2A	Class 2B	Class 3A	Class 3B	Class 4A	Class 4B
Table %	55-60%	60.1-61.5% 53-54.9%	61.6-62% 52-59%	62.1-64% 51-51.9%	64.1-67% 50-50.9%	67.1-70% 49-49.9%	70.1-72% 48-48.9%	>72% <48%
Crown Height %	13-14.5%	12.5-12.9% 14.6-15%	12-12.4% 15.1-15.6%	11.1-11.9% 15.7-16.5%	9.7-11% 16.6-17.3%	8.7-9.6% 17.4-18.4%	7.8-8.6% 18.5-19.5%	<7.8% >19.5%
Girdle Thickness %	Very Thin to Slightly Thick or Thin to Thick 0.4% to 4.5% or 1% to 5.5%		Very Thin to Thick 0.4% to 5.5%	Very Thin to Very Thick 0.4 to 7%	Very Thin to Very Thick 0.4 to 7%		Extremely Thin to Extremely Thick 0% to > 7%
Total Depth %	59.0-63.0%			63.1-65.4% 58-58.9%	65.5-68.5% 56-57.9%	68.6-71% 46-55.9%	71.1-73% 43-45.9%	>73.0% <43.0%
Length / Width Ratio	Pear 1.50 - 1.75 Marquise 1.75 -2.25 Heart 0.98 - 1.02 Oval 1.33 - 1.66			Pear 1.26 - 1.99 Marquise 1.51 - 2.49 Heart 1.24 - 0.91 Oval 1.26 - 1.74			> Class 3 < Class 3
Polish / Symmetry	Excellent to Good			Good to Fair			Fair to Poor

Argyle Pink Diamond Chart

Argyle pink diamonds are unique to the point that a dedicated grading system has been developed by Argyle Pink Diamonds. The system grades each stone predominately by colour. For example, as shown on this chart, a 1p is an intense pink, with graduations in colour through to 9p. Colours range from Red to Pink, Purplish Pink, to Pink Rose, Pink Champagne and Violet.