The link takes you to the tutorial area that tells you about the AGS Ideal proportion. Basically, you can maximise the weight of the diamond while sticking to the AGS Ideal range... and create a mediocre performer. AGS Ideal proportion does not gaurantee performance.
AGA 1A cut grades pretty much do insure a very high degree of light performance. We were all too aware of the AGS problem at their top grades many years ago, but few wanted to listen....Now, it seems like this issue is common knowledge.
It is good news that they are re-writing the system, but it has been not such good news for many who blindly opted for those not so well cut AGS 0 grade stones over the past several years. There was better information available, but few were able to find it. I credit Pricescope with being one of those places that has truly helped not only consumers, but pushed industry issues out into the open so that improvement becomes mandatory. Better late than never is one way to look at it.
I'd like to think that AGA along with Imagem, Inc. will offer a technologically advanced system in our offices at AGA in the next few months that will equal or outperform GIA's and AGS's yet to be released systems in not only determining the quality of cut craftmanship, but in defining and grading light behavior. While this is not quite ready for action today, don't think AGA or Imagem is going to drop the ball on these very important issues which affect the consumer and the trade.
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