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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 |
|
|
|
|
|
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 |
|
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