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Diamond Cut Grading chart. Triple Excellent, Hearts & Arrows, proportions, measurements for perfect diamond cutting
Ideal or excellent cut diamonds are controversial. The proportions, glitter, brightness or brilliance and beauty are subjective!
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 :
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!
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 Gemmological 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 Gemmological Institute View Diamond Certificate
GIA – Gemmological Institute of America
With the right proportions a brilliant round diamond will be called 'ideal cut',
not an 'official' term to describe cut quality by the way
How Diamond Laboratories grade Cut - Polish - Symmetry
1. Proportions
Excellent, Very Good, Good, Fair, Poor or Unusual
Premium Ideal Cut: Hearts & Arrows is the Art of cutting and for far the best cut!
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
4. Hearts and Arrows
Ideal Cut = Triple Excellent + Hearts & Arrows = Best Value!
Approximate Diamond Cut Grade Chart for round brilliant diamonds
If you are not sure, trust the opinion of the Expert, the independent Grading by a reputable Gemmological 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
Learn more about diamonds: diamond course for free
Buy Perfect cut, Triple Excellent, Hearts & Arrows diamonds within your budget at the source:
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This page was last updated: November 16, 2009
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 %
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