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Online Diamond Education: Diamond Value

Diamond Cut Grading	Diamond Color Grading
1. Ideal Cut Diamonds 2. Diamond Value 3. Diamond Proportion 4. Diamond Grading	5. Diamond Color
	Diamond Clarity Grading
	6. Diamond Clarity 7. Examples of Diamond Clarity

Recommended Ideal Cut Proportions

One of the grades affecting a diamond's price is the cut. Each type of diamond has its own specifically cut proportions. Those measurements are relational to the diamond price. The chart below lists various diamond types, their characteristics and the proportions from ideal to poor.

Diamond Cut Grade	IDEAL	PREMIUM	GOOD	FAIR-POOR
Difference in Value	10-15% More	5-10% More	0% Even	10-20% Less
TYPE: ROUND BRILLAINT
TABLE %	53-57	58 - 61	61 - 64	65 +
DEPTH %	62.5-60.6	62.9-59.5	63.9-57	64 + or 57 -
POLISH	Excellent - Very Good	Verygood - Good	Good	Fair - Poor
SYMMETRY	Excellent - Very Good	Verygood - Good	Good	Fair - Poor
CULET	None - Very Small	None - Small	None - Small	Medium - Large
GIRDLE	Thin - Medium	Thin - Thick	Very Thin - Thick	Extremely Thin - Very Thick
TYPE: SQUARE CUTS - PRINCESS, RADIANT, EMERALDS
TABLE %	65-70	71-75	76-84	85 +
DEPTH %	65-71	71-75	76-80	80 +
POLISH	Excellent - Very Good	Verygood - Good	Good	Fair - Poor
SYMMETRY	Excellent - Very Good	Verygood - Good	Good	Fair - Poor
CULET	None - Very Small	None - Small	None - Small	Medium - Large
GIRDLE	Thin - Medium	Thin - Thick	Very Thin - Thick	Extremely Thin - Very Thick
TYPE: ELONGATED CUTS - RADIANTS, EMERALDS
TABLE %	65-69	70-74	75-80	80 +
DEPTH %	64-69	63-71	72-78	79 +
POLISH	Excellent - Very Good	Verygood - Good	Good	Fair - Poor
SYMMETRY	Excellent - Very Good	Verygood - Good	Good	Fair - Poor
GIRDLE	Thin - Medium	Thin - Thick	Very Thin - Thick	Extremely Thin - Very Thick
CULTE	None - Very Small	None - Small	Small - Medium	Medium - Large
LEGNTH/WIDTH RATIO	1:1.35-1:1.42	1:1.29- 1:1.49	1:1.20-1:1.6	Subjective
TYPE: PEAR
LEGNTH TO WIDTH	1.45:1-1.6:1	1.35:1-1.7:1	1.25:1-1.8:1	1.2:1-2:1
BOW TIE EFFECT	None - Minimal	Minimal - Average	Average - Significant	Significant
DEPTH %	59-63	57-65	55-68	50-75
TABLE %	55-58	53-61	50-64	48-69
SYMMETRY	Excellent - Very Good	Verygood - Good	Good	Fair - Poor
SYMMETRY	Excellent - Very Good	Verygood - Good	Good	Fair - Poor
GIRDLE	Thin - Medium	Thin - Thick	Very Thin - Thick	Extremely Thin - Very Thick
CULET	None - Very Small	None - Small	None - Small	Medium - Large
TYPE: MARQUIS
LEGNTH TO WIDTH	None - Minimal	Minimal - Average	Average - Significant	Significant
BOWTIE EFFECT	1.95:1-2.05:1	1.8:1-2.2:1	1.65:1-2.3:1	1.5:1
DEPTH %	59-63	57-65	55-68	50-75
TABLE %	55-58	53-61	50-64	48-69
SYMMETRY	Excellent - Very Good	Verygood - Good	Good	Fair - Poor
SYMMETRY	Excellent - Very Good	Verygood - Good	Good	Fair - Poor
GIRDLE	Thin - Medium	Thin - Thick	Very Thin - Thick	Extremely Thin - Very Thick
CULET	None - Very Small	None - Small	None - Small	Medium - Large
TYPE: OVAL
LEGNTH TO WIDTH	1.35:1-1.42:1	1.3:1-1.5:1	1.25:1-1.65:1	1.15:1-1.9:1
BOWTIE EFFECT	None - Minimal	Minimal - Average	Average - Significant	Significant
DEPTH %	59-63	57-65	55-68	50-75
TABLE %	55-58	53-61	50-64	48-69
SYMMETRY	Excellent - Very Good	Verygood - Good	Good	Fair - Poor
SYMMETRY	Excellent - Very Good	Verygood - Good	Good	Fair - Poor
GIRDLE	Thin - Medium	Thin - Thick	Very Thin - Thick	Extremely Thin - Very Thick
CULET	None - Very Small	None - Small	None - Small	Medium - Large