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When people think of cut, they often think it’s the shape of the diamond. But, it’s about how light is returned due to a diamond’s facets. Cut is responsible for brilliance, fire, and scintillation of a diamond.
Brilliance is the combination of all of the white light reflected from the surface and the inside of the a diamond
Fire are flashes of color you see in a polished diamond
Scintillation are flashes of light you see when the diamond, the light, or the observer moves
For the best results, proportions of its facets, symmetry, the relationship of its weight to its diameter, girdle thickness, and quality of its polish have to come together in just the right way.
A diamond’s color is measured using the GIA® D-to-Z diamond color grading system. This system is the most widely accepted for grading. All diamonds are evaluated based on the absence of color.
No hue = higher value
This lack of color is measured in degrees based on comparisons with masterstones, made while viewing under controlled lighting and conditions. This means that regardless of where in the world the diamond is graded it will be under the same conditions and should receive the same grade. These color distinctions are invisible to the untrained eye and should be left to a trained diamond grader.
Just as a diamond’s color is graded on the absence of color, the diamond’s clarity is graded on the absence of inclusions and blemishes.
Internal characteristics = Inclusions
External characteristics = blemishes
Most are smaller than can be seen by the unaided eye. And, accurate assessment is of utmost importance. So, trained diamond graders evaluate the quantity, size, relief, nature, position of these characteristics, and how they affect the appearance of the diamond.
|Flawless: No internal or external flaws
Internally Flawless: No internal flaws
|Very, very slightly included: Very difficult to see inclusions under 10X magnification|
|Very, slightly included: Inclusions are not typically visible to the unaided eye|
|Slightly included: Inclusions are visible under 10X magnification and may be visible with the unaided eye|
|I1, I2, I3
|Included: Inclusions are visible with the unaided eye|
In addition to color, cut, and clarity, carat weight directly correlates to price of the diamond. This happens because the supply is low (larger = rarer) and demand is high (larger = more popular).
1 Carat = 200 milligrams
1 Point = 0.01 carat = 1/100 of a carat
Diamonds of equal weight are not necessarily the same size. Different proportions and depths will result in different size and weight combinations.
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