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Antwerp World Diamond Center, Diamond Exchange Diamantkring - Hoveniersstraat 2, BE-2018 Antwerp / Belgium / Europe 
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Diamond Cut Grading Chart: Actual Ideal Cut | Perfect Cut | Triple Excellent | Hearts & Arrows,
The Cut quality missing link on Rapaport prices completed 
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 - View also ideal proportions fancy shapes  One minute Diamond Course for Free
Diamond cutting & polishing is the art, skill and science of transforming a rough stone into a brilliant diamond.
'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. Quality variations chart
The sparkling quality of the cut is to be determined by 3 separate factors:

1. Proportions
2. Polish
3. Symmetry

What are ideal cut diamonds? Read more about

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 Center (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

Triple Excellent cut
When proportions, Polish and Symmetry are graded Excellent it is named Triple Excellent

Ideal cut = Perfect cut = Triple Excellent + Hearts & Arrows = Best Value! 
When Proportions, Polish, Symmetry are graded Excellent

4. Hearts and Arrows - The Top in the Art of cutting read all about. 

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  

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This page was last updated: October 14, 2014
diamond proportions measurements picture
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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Approximate ideal proportions for fancy shapes:
Please note that there are no ideal proportions for fancy shapes: they are fancy!

Shape           ideal length          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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Antwerp World Diamond Center, Diamond Exchange, Hoveniersstraat 2, Antwerp / Belgium / Europe