Determine the exact price of a diamond by quality variations / different factors!
Prices vary from minus 60% to Premiums of + 50% 

Transparency in diamond prices according to over one million diamond quality differences and failures in Cut, Polish, Symmetry, Finish Grade, Fluorescence, Girdle Thickness and Clarity. 

Adjust the price in function of the quality in addition to the Rapaport standard.

The missing link on average wholesale prices completed. Differences in quality clearly explained. 
Consider the girdle thickness as an additional important quality variation. With a very thin girdle the diamond can easily break!
Avoid buying diamonds with very thin girdle thickness.
Source: Antwerp World Diamond Center

The factors that make diamonds more or less expensive in price. Read more about the 8C's:
+ 7% for Nil Fluorescence in addition to all other quality factors
+ 29% for EX EX EX,  Hearts & Arrows Super Ideal Cut 
           Extremely Rare
+ 25% for Triple Excellent Cut
          Very Very Rare
- 30% for Unusual and Fancy Cut
+ 12% for Mixed Excellent, Very Good Cut 
          Very Rare
+ 10% for Triple Very Good Cut
+ 0% for Mixed Very Good and Good Cut 
- 20% for good Cut
- 25% for Mixed Good and Fair cut
- 50% for Fair Cut 
- 60% for poor Cut 
+ 50% for EX EX EX H&A Super Ideal Cut and FL Flawless
           only a few in the world market
Quality Factors grading chart image
This page was last updated on: March 20, 2017
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Antwerp World Diamond Center, Diamond Bourse, Hoveniersstraat 2, Antwerp / Belgium / Europe