Most people will be familiar with the 4C’s of diamonds that include the cut, clarity, color grade, and carat weight. All these attributes are mainly considered to determine the quality of a gemstone. Since unskilled people rely on a credible diamond grading report such as a GIA certificate to determine the quality of their sparklers, all these 4 characteristics will be documented in a GIA grading report. Note that GIA certification is given prime priority by most diamond buyers because of their credibility and the unbiased reports documented by the agency.
The way a diamond is graded is almost the same in most cases. However, it tends to differ when it comes to assessing the color of a diamond. While most of the diamond mined from the earth is colorless and nearly colorless that falls in the D to Z color range, you can rarely find some naturally colored diamonds as well. Note that the diamond color grading scale tends to differ with the diamond grading lab. Some of those common colors that you can see in natural colored diamonds include blue, pink, red, green, brown, black, yellow, etc. According to GIA, there are around 27 natural colored diamond variants on the earth.
Unlike colorless diamonds, colored diamonds are not graded based on their brilliance and fire. Rather, they are evaluated based on their color intensity. Higher the color intensity of diamonds; better will be its quality. However, it is extremely rare to find vivid or dark shades of a natural colored diamond. Hence, such gemstones will be incredibly expensive.
When it comes to GIA grading, colored diamonds are mainly assessed based on three factors; tone, hue, and saturation. On a related note, the hue defines the characteristic color of a diamond, the tone is used to indicate the relative darkness or lightness of the color, and the depth or strength of the color is defined by its saturation. GIA grading involves color comparators and highly controlled viewing conditions to yield the best results. Most reputed diamond sellers all around the world used to rely on the color grading system created by GIA.
Furthermore, there are two types of GIA grading reports for colored diamonds; the GIA colored diamond grading report and GIA colored diamond identification and origin report. The former is the same as that of a regular grading report that documents the 4C’s of diamonds. The latter, on the other hand, is a color-only report that is focused solely on the color grade and the origin of the color.