The complete guide on diamond cut grades

The cut of a diamond is the way it has been designed and crafted by its makers. The craftsmanship is of great importance as it ultimately determines the sparkle and brilliance of the stone. This involves various aspects such as symmetry, depth percentage, or table percentage. These factors are extremely important in determining the value of a diamond. There are various parameters that determine how good or bad is the cut of the stone. Diamond cut is graded on a scale that ranges from Excellent to Poor.

However, this article is all about that, so, let’s get started:

The 4 C’s, Cut, Color, Clarity and Carat

A diamond’s carat weight is only one criterion used to determine its value. Diamonds are sold by weight (in carats), but there is more to the value of a diamond than just weight, and different buyers weigh different things when they’re trying to find the best deal on diamonds. For instance, many buyers focus their attention solely on diamond carat weight, while others believe that every aspect of a diamond 4c (cut, color, clarity, and carat) contributes equally to its value.

The truth lies somewhere in the middle. A diamond’s weight does affect its price to some degree – but so do each of the 4 Cs. Just how much it impacts the cost of a stone depends on which ones are out of line with the average, and how much.

Understanding SI1-SI2-SI3-I1-I2 grades in diamonds

Understanding the illustrations of the 4Cs (cut, color, clarity, and carat), SI1-SI2-SI3-I1-I2 grades in diamonds

The most common diamond cut grading scale is used by AGS (American Gem Society) to grade various aspects of a stone’s cut. This includes what is known as the ‘length to width ratio’. This is determined by checking the height, depth, and diameter of a diamond.

Pavilion angles are also assessed on this grading scale. The portions are sized according to where they come into contact with the table facet (the square section that holds up your diamond).

The pavilion depth is measured in relation to the diamond’s girdle (the widest point of the stone).

Clarity grading scale

The GIA (Gemological Institute Of America) uses a four-step process to grade clarity. This grading system goes in-depth into examining inclusions within diamonds, which can either be eye-visible or barely visible to the naked eye (fractures).

Color grading scale

The color of a diamond is graded on a D-Z scale. This type of grading system goes from D to Z, where D represents colorless diamonds, and Z has a yellow tint.

What is a diamond cut grade and how does it affect the price of a diamond?

A diamond’s cut quality can have a significant impact on its beauty and value. A poorly cut stone with visible inclusions or an irregularly shaped outline may look dull or ‘lifeless’ compared to a well-cut diamond. Therefore the cut is one of the most important factors in determining not only a diamond’s beauty but also its value.

The cut grade is determined by how well the angles and proportions of a stone reflect and refract light (whereas the shape itself is given an ‘outline’ grade). The closer to ideal values for the proportions, angles, and finish of a diamond the stone is cut, the more light will be returned through the top of the stone (the table), which makes it sparkle.

The overall cut grade is typically given as one of five ratings: Excellent, Very Good, Good, Fair, or Poor. A high overall cut grade indicates that the diamond has been cut to near-perfect proportions for its carat weight, while a low overall cut grade suggests that the diamond has been poorly proportioned for its carat weight.

Comparatively speaking, well-cut diamonds are rarer than their less-well cut counterparts, and therefore command higher prices. However, unlike other types of jewelry such as gold and platinum, a small diamond is usually worth more when its cut is of better quality. This happens because most diamonds are too small to allow for large inclusions or blemishes – meaning they can only be excluded from the market by being poorly proportioned. In fact, some high-quality white diamonds may lose value if they’re not cut too deep.

For example, a 0.5 carat round diamond with an ‘Excellent’ cut grade can be priced at $4000 to $5000, while the same-sized diamond with a ‘Good’ cut grade would likely fetch less than half of that price (closer to $2000). While this particular diamond will weigh exactly the same no matter what its cut grade is, an ‘Excellent’ graded diamond will always be more valuable than a ‘Good’-graded diamond because it reflects and refracts more light.

It’s important to note that the price of a stone is not only affected by its cut. Diamonds are also priced according to their carat, color, and clarity – all of which must be within certain tolerances for the diamond to be considered ‘eye-clean. A well-cut diamond with moderate color is always more valuable than a poorly cut stone with higher color grades.

Jennifer Alex

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