Diamond grading has a long history that can be traced back to the Roman Empire, where it was initially used to sort and categorize stones. As the popularity of diamonds grew over time, various regions worldwide introduced their own grading systems. However, these different systems often resulted in discrepancies, especially during inter-regional trade.

In the late 1800s, grading models began incorporating letters, such as A, B, C, A, AA, AAA, and I, II, III. However, with the establishment of the Gemology Institute of America (GIA), a new and standardized grading structure was introduced. This new system utilized letters from D to Z, effectively replacing the old grading system and preventing confusion among consumers and traders alike. The GIA's grading system has since become widely accepted and is now the industry standard for diamond grading and certification.

Beautiful VS2 Diamond with G Color and Ideal Proportions (Watch in HD).

The color grading begins after establishing the carat weight and proportions and examining the diamond's clarity and finish. The next step involves comparing the diamond to a set of master stones ranging from D to Z, representing different clarity levels. The diamond is carefully compared against each stone in the set to determine the closest match in color.

Following this comparison, the diamond is observed under ultraviolet light to assess its reflective capabilities. The grading environment typically uses a gray or white background to achieve the most accurate results.

To further enhance the accuracy of the grading, multiple graders may repeat the entire procedure independently, and a consensus will be reached to determine the final grade of the gem. This collaborative approach ensures a more reliable and precise diamond color grade assessment.

D, E, F:

The grades D, E, and F represent the higher end of clarity and are considered the best quality. D holds the highest rank, displaying no visible color blemishes even under careful scrutiny. However, diamonds in these grades are known for their rarity, brilliance, and higher cost. According to GIA standards, diamonds in grades D, E, and F are categorized as colorless.

G, H, I, J:

The grades G, H, I, and J fall just below the previous category in terms of clarity. Diamonds in this range are described as near colorless, exhibiting only a slight color tinge that is not easily noticeable except under intense inspection. They offer excellent value as they come close in quality to the D, E, and F grades but are slightly more affordable. These diamonds are relatively easier to find than the higher-grade categories. To an untrained eye, the stones appear brilliant, with only a slight difference compared to a master stone of the higher grade class.

K, L, M:

The next grade class is K, L, and M, which displays a slightly faint yellow hue. This light coloration is noticeable to an untrained eye and distinguishes them more significantly from the former two grade classes. Good-cut diamonds in this grade class can be obtained at a better bargain.

N to R:

The N, O, P, Q, and R categories are characterized by their pronounced yellow hue and are termed very light yellow to slightly light brown. Due to the noticeable hue, these diamonds are considered lower in quality. Setting these diamonds in yellow gold mounts can be a good option to tone down the yellow color. Despite their lower quality, they are more affordable and easily accessible.

S to Z:

The S to Z category represents the lower end of the grading system. Diamonds in this range have a light yellow to light brown coloration. They are easily accessible and affordable, as their quality is not considered high-end. S-graded diamonds exhibit a yellowish tinge under the naked eye, while the Z category appears light brown.

Notably, it is incorrect to assume that lower-grade diamonds have negligible worth. With a well-cut and appropriately proportioned weight in carats, lower-grade diamonds can offer great value, especially if they rank higher in polish, symmetry, and finish. Pairing them with a high-quality gold mount can further enhance their appearance.

Diamonds with slightly higher coloration beyond the Z grade are no longer considered clear. Instead, they are evaluated under fancy diamonds with a separate grading system. Popular fancy color stones include red, pink, orange-red, yellowish-orange, and so forth. These stones are often evaluated based on their transparency and depth of color, i.e., faint, fancy, light, and deep. It may be noteworthy that high-quality fancy color natural diamonds are much pricier compared to white diamonds.

The G grade in the near-colorless range offers the best value due to the subtle distinction between it and the highest-quality diamonds in the preceding D to F grades. The color of the diamond is almost the same, with only a slight hint of color that experts can detect under specific conditions. The great value comes in pricing, as the D to F grades are rare and highly priced.

On the other hand, the G grade is not as rare as a D color, making it more affordable. Since the color difference is not easily distinguishable, choosing the G color allows you to obtain a gem with excellent color at a more manageable price. When paired with an ideal cut, excellent polish, and a fantastic finish, the G color diamond provides the best bargain, showcasing a clear sparkle and brilliance.

For the best value in terms of quality and pricing, consider looking for G diamonds, as they offer a balance between price and quality. Opting for a GIA or AGS certified loose diamond is always advisable, guaranteeing authenticity and quality. Both organizations are respected and provide trustworthy diamond grading reports. If budget is an issue, you may also want to learn more about lab-grown diamonds versus natural diamonds.