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.
Gia ideal cut diamond proportions.
In the first section we will provide our best summarized insights on ideal proportions for round and non round fancy shape diamonds.
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Ideal cut diamond proportions and brilliance.
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But the more a diamond is within super ideal cut proportions the better the light performance will be.
If a diamond is only slightly outside of super ideal cut proportions it will not matter that much.
This short video explains the gia cut scale and how gia classifies round brilliant cut diamonds with a cut grade ranging from excellent to poor by factoring in a range of parameters including the diamond s proportions culet size girdle thickness polish and symmetry descriptions.
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.
The gia system places more emphasis on the overall appearance of the diamond as opposed to any single set of proportions.
What to look for your eye sees those proportions working together for better or worse when you look at a diamond face up.