The gia system places more emphasis on the overall appearance of the diamond as opposed to any single set of proportions.
Gia ideal cut diamond proportions.
What to look for your eye sees those proportions working together for better or worse when you look at a diamond face up.
By learning about proportions you ll also learn the basics of a diamond s anatomy and gain an understanding of one factor that goes into setting a cut grade determined from a combination of measured parameters.
But the more a diamond is within super ideal cut proportions the better the light performance will be.
This article has two sections.
Ideal cut diamond proportions and brilliance.
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Please note that gia does not assign a cut grade to fancy cut stones such as princess cut or cushion cut yet but still these proportions are critically important in analyzing the cut.
In the first section we will provide our best summarized insights on ideal proportions for round and non round fancy shape diamonds.
In this post we ll focus on proportions represented by the diamond diagram that appears on all gia diamond grading reports and gia diamond dossiers.