In the first section we will provide our best summarized insights on ideal proportions for round and non round fancy shape diamonds.
Gia ideal cut diamond proportions.
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.
Ideal cut diamond proportions and brilliance.
This article has two sections.
What to look for your eye sees those proportions working together for better or worse when you look at a diamond face up.
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.
If a diamond is only slightly outside of super ideal cut proportions it will not matter that much.
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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.