Education - Diamond Cut | Adiamor
Education - Diamond Cut | Adiamor

Diamond Cut

A diamond's cut is considered to be the most important of the four Cs. It is important to understand how a diamond's proportions and the relationship between them affects its brilliance, fire, and scintillation.

Most diamonds are "spread" in their cutting to retain maximum weight from the original rough diamond. This technique results in a heavier diamond and also sacrifices the potential fire and brilliance of the stone. The width and depth have the greatest effect on how light travels within the diamond, and also how light exits the diamond in the form of brilliance.

Shallow Cut Diamonds


Deep Cut Diamonds


A diamond's cut is graded by several measurements. Its depth percentage (a measurement of the height vs. the width of the stone) and its table percentage (a measurement of the diameter of the top facet of the stone vs. the stone's average width) are two key factors in determining the quality of a diamond's cut. These percentages are detailed on the GIA or AGSL Diamond Grading Report that accompanies every Adiamor loose diamond. Experts express differing opinions on the best table size (the diameter of the largest facet on the top of the stone) and the best depth for a diamond, because these two factors alone are not sufficient enough to accurately judge a diamond's cut. Other factors such as crown angle, girdle thickness, culet size, polish and symmetry all play a role in judging a diamond's overall cut quality.

Diamond Characteristics


Polish & Symmetry

Although polish and symmetry are graded under 10x magnification they can both have an effect on the overall appearance of a diamond. Polish refers to the quality of the diamond's surface and includes such features as nicks, polish lines and abrasions. Symmetry refers to the exactitude of the shape and alignment of the facets.

Off-center Culet

Misshapen Facets

Off-center Table

The polish and symmetry grades are listed on each diamond's detail page and within their accompanying GIA or AGSL diamond grading report.

GIA grades polish and symmetry as: Excellent (EX), Very Good (VG), Good (G)

AGSL grades polish and symmetry as: Ideal (ID), Excellent (EX), Very Good (VG), Good (G)

Adiamor does not carry diamonds with polish and symmetry grades of: Fair (F), Poor (P)

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