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Diamond Cut Grading Chart: Actual Ideal Cut | Perfect Cut | Triple Excellent | Hearts & Arrows, proportions, measurements
Ideal or excellent cut diamonds are premiums. The proportions, glitter, brightness or brilliance and beauty are subjective and controversial!
Table, Crown hight, Pavillion, Cullet you can compare it with ideal proportions of human beings. One likes or doesn't like
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Diamond cutting is the art, skill and science of changing a diamond from a rough stone into a faceted gem.
'Cut' has two meanings in relation to diamonds. The first is the shape: round, oval and so on. The second relates to the specific quality of cut within the shape and the quality and price will vary very greatly based on the cut quality. Read more about at Wikipedia, the art of diamond cutting
Shape is the model or form of the diamond, such as round, oval, pear, princess and more.
Cut refers to proportions and the finish grade.
The cut is the most important element to reflect brilliance and is determinable by 3 separate descriptions:
The cut is the most important element to control brilliance, scintillation and fire.
The sparkling quality of the cut is to be determined by 3 separate factors:
1. Proportions
2. Polish
3. Symmetry
Important notice
if yo do not want to get crazy to find out the best cut by yourself...
If you are not a professional or familiar with the cut grading, trust
the independent Grading by a reputable Gemological Laboratory.
Best view the diamond loose and its genuine grading document
at the diamantaire.
The trustworthy grading and Diamond Certificates are mostly from:
HRD – Diamond High Council of Antwerp World Diamond Centre (non profit!)
IGI – International Gemological Institute View Diamond Certificate
GIA – Gemological Institute of America
How Diamond Laboratories grade Cut: Proportions - Polish - Symmetry
1. Proportions
Too shallow and / or too deep cut diamonds will loose brilliance through the side and bottom.
The result is a dull diamond with less brilliance, affecting the ultimate value in terms of quality and price!
Excellent, Very Good, Good, Fair, Poor or Unusual
2. Polish
Finish grade or polish for ideal cut diamonds are described as following:
All facets of a diamond are carefully polished to eliminate all imperfections, characteristics such as abrasions,
scratches, nicks and polishing marks on the surface of the diamond to give the mirror shine and the final beauty touch.
Polish grading: Excellent, Very Good, Good, Fair, Poor or Unusual
3. Symmetry
is the balance and regularity / evenness of facets.
Facets are compared in opposing pairs, defined as following:
Symmetry grading: Excellent, Very Good, Good, Fair, Poor or Unusual
Cut Grading | Ideal Cut | Perfect Cut | Triple Excellent | Hearts & Arrows | Diamond certificates - Certificates images
Triple Excellent cut
When proportions, Polish and Symmetry are graded Excellent it is namend Triple Excellent
Ideal cut = Perfect cut = Triple Excellent + Hearts & Arrows = Best Value!
When Proportions, Polish, Symmetry are graded Excellent
Measurements for Round Brilliant diamonds Measurements of fancy cut diamonds
I repeat once again:
if yo do not want to get crazy to find out the best cut by yourself's... If you are not a professional or familiar with the cut grading, trust
the independent Grading by a reputable Gemological Laboratory. Best view the diamond loose and its genuine grading document
at the diamantaire.
If you are not sure, trust the opinion of the Expert, the independent Grading by a reputable Gemological Laboratory!
Proportions: Total depth % Table % Crown % Crown angle ° Pavilion % Pavilion angle °
Excellent: 58.0 - 63.5 52.0 - 63.0 12.0 - 16.5 31.5 - 36.5 42.0 - 44.5 40.0° - 41.7°
Very Good: 55.0 - 65.5 52.0 - 66.0 10.0 - 17.5 28.5 - 38.0 41.5 - 45.0 39.7° - 42.3°
Good: 53.0 - 69.0 50.0 - 70.0 8.5 - 19.0 26.0 - 40.0 41.0 - 46.5 39.4° - 42.9°
Fair & poor: less than less than less than less than less than less than
Girdle:
Excellent: Thin to slightly thick
Very Good: Very thin up to thick
Good: Extremely thin to very thick
Fair & poor: Other
Buy Perfect cut, Triple Excellent, Hearts & Arrows diamonds within your budget at the source:
Consult this diamond buying guide Success within 48 hours guaranteed!
This page was last updated: August 4, 2010
Actual diamond cut grading chart, perfect cut diamonds - Triple Excellent - Hearts & Arrows
100 %
Total depth 58.0 - 63.5 %
Ideal Table size 52.0 - 63.0 %
Crown depth12.0 - 16.5 %
Crown angle 31.5 - 36.5°
Crown
Pavilion hight 42.0 - 44.5 %
Pavilion angle 40.0° - 41.7°
Cullet: pointed 0 - 1 %
Girdle thickness: 1.8 - 2.0 %
Ajediam Ltd & CMR Inc. Rough Diamonds Import - Diamond Manufacturer Cutting Polishing Diamonds - Wholesalers Your Diamond Company
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Approximate ideal proportions for fancy shapes:
Please note that there are no ideal proportions for fancy shapes: they are fancy!
Shape ideal lenght width
Oval 1.30 to 1.68 1.00
Marquise 1.75 to 2.25 1.00
Princess 1.00 to 1.10 1.00
Pear 1.50 to 1.75 1.00
Heart 1.00 to 1.10 1.00
Emerald 1.50 to 1.75 1.00
The depth percentage of an fancy cut diamond is generally determined by dividing the length to width ratios
Diamond Proportions
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