Allurez Diamonds & Fine JewelryAllurez Diamonds & Fine Jewelry

Diamond Buying Guide: Diamond Cut Education

The cut of a diamond is one of the most important characteristics and has the greatest overall impact on a diamond’s beauty.  The cut of a diamond determines a diamond’s sparkle.  A diamond with a good cut grade sparkles because the light will be properly returned out of the top of the diamond and catches the viewer’s eye.  In a poorly cut diamond the light will leak out the bottom or sides resulting in a loss of brilliance and sparkle.  Because the cut is so important to a diamond’s overall image, we recommend selecting the highest cut grade within your budget.

Shallow (Poor Brilliance)
1. Shallow (Poor Brilliance)
Ideal Cut
2. Ideal Cut
Deep (Poor Brilliance)
2. Deep (Poor Brilliance)

How Cut Is Graded:

A diamond’s cut grade is based on the assessment of seven components.

Appearance Based:
1. Brightness: the combination of all white light reflecting from the interior and the surface of a diamond.
2. Fire: dispersion of light into the colors of the spectrum.
3. Scintillation: flashes of light, or sparkle, when a diamond is moved.

Design and Craftsmanship:
4. Weight Ratio: The ratio of a diamond millimeter versus its weight
5. Durability: A diamonds resistance to breaking or chipping
6. Polish: smoothness of facets, graded poor to excellent
7. Symmetry: refers to the alignment of the facets

How Diamond Cut is rated:

GIA Cut Grading:

Excellent Excellent cut reflects maximum light entering the diamond, thus the diamond has an optimum shine. This cut is extremely rare.

Very Good: Very Good cut indicates superior cut, and is slightly less expensive then Excellent Cut.

Good: Good Cut diamonds reflect light to obtain a good amount of brilliance and shine, but not equal to Very Good cut diamonds. Good Cut diamonds can be a very economical choice for a limited budget.

Fair: Fair Cut diamonds reflect less light than Good Cut diamond, but are better than Poor Cut diamonds.

Poor: Poor Cut diamonds are usually too deep and narrow, or shallow and wide,    that the light is unable to reflect back from the diamond.

AGSL Cut Grading:

Ideal (0 Cut): The highest possible cut grade in terms of all the cut quality factors.

Excellent (1 Cut): Superior cut quality. Very slight variations in one or more of the diamond cut quality factors, which be detected almost only by a computer.

Very Good (2 Cut): High level of diamond cut. Slight variations in one or more of the diamond cut quality factors, which be detected almost only by a computer.

Good (3 & 4 Cut): Minor Variations in 1 or more diamond cut quality factor, which could have a slight effect on a diamonds beauty, durability, or size appearance.

Fair (5, 6 & 7): Substantial variations in 1 or more diamond cut quality factors. A grade 5 diamond has little effect on a diamonds’ beauty, durability, or size appearance, where a grade 7 diamond has a higher effect.

Poor (8, 9, & 10): Major variation in 1 or more of diamond cut quality factor, which can have a significant (8) to serious (10) negative effect on a diamond’s beauty, durability, or size appearance.
If a diamond cut grade is not assigned by GIA, AGSL, or other third party laboratories, Allurez will determine the appropriate cut grade based on 6 qualities: Depth Percentage, Table Percentage, Girdle Thickness, Cutlet Size, Polish, and Symmetry. (This is an estimate and might be slightly different than if actually graded by the laboratories)