One of the four Cs which determines the quality is the diamond cut. It is the most complex to understand as well as the most important characteristic in choosing a diamond. The cut refers not only to the diamond's proportions and symmetry, but also to the delicate crafting of each and every facet. The combination of these factors, together with the polish and overall finish is known as the cut of the diamond.
The cut of a diamond is often related to the final diamond shape but not always.
To understand some of the finer points of diamond cuts, it's necessary to first understand some basic diamond vocabulary.
Diameter: The width of the diamond from one side of the girdle to the other.
Table: The large facet (face) at the top of the diamond.
Girdle: The edge of the diamond between the crown and the pavilion. The girdle is the area of the diamond with the largest circumference.
Crown: The top part of the diamond from the girdle to the table.
Culet: The minute facet on the bottom tip of the diamond.
Pavilion: The part of the diamond from underneath the girdle to the culet.
Depth: The diamond measurement from the table to the culet.
Every diamond has its own, unique proportions which directly affect the way light travels through the diamond and is reflected back up through the table. This, in turn, influences the sparkle, or brilliance of the diamond and its perceived beauty. In fact, the cut of a diamond, far more than its color or clarity, affects its splendor.
If a diamond is cut too shallow, light can escape from underneath, reducing the brilliance. If the cut is too deep, light can spread out from the sides, again affecting the sparkle. A diamond with good proportions will allow the light to travel inside the diamond, reflecting the light through the table and crown for maximum sparkle.
The sparks or small flashes of light often seen as a diamond moves are otherwise known as scintillation. As well as brilliance, which is essentially the amount of white light reflected by the diamond, the cut also influences the amount of fire and scintillation of the diamond. The fire is the way the light is refracted by the diamond, splitting it into the beautiful colors of the rainbow.
At 25karats-Diamonds, our diamonds are graded for cut according to the following scale:
Excellent Cut (E): Our highest cut grade, this diamond is cut with proportions which allow the maximum brilliance to shine through.
Very Good Cut (VG): This diamond has first-rate proportions and offers outstanding sparkle and brilliance at a cost-effective price.
Good Cut (G): A fine diamond, offering significant sparkle and brilliance. This grade represents excellent value for money.
Fair Cut (F): Although it doesn't allow as much light, this diamond generates a decent amount of brilliance and fire. Fair cut diamonds usually offer good carat weight and size options for a budget.
* Diamonds which have a GIA or IGI Report are graded according to the scale of those organizations.