The major Gem labs have been working for years to set a system to qualify Cut quality of diamonds and now after some 10 years and millions of dollars they have systems that indicate to the public that a diamond cut, accoring to them, Excellent or "O" which we feel is off the mark. Since the eCS system indicates if a diamond is Cut = 1,000 it is Ideally Cut, the best shape for the best Sparkle, or a variance from it.( less than 1.000)
Answer:
The eCS system may be flawed, but so are the GIA and AGS systems (which apply only to Round Brilliant cuts). Ultimately, however, the GIA and AGS systems are widely recognized and the eCS is not.
Hope this helps!
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