Diamond Scale
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Diamond scale

Understand the grading
scale for loose diamonds

The 3 most important diamond scales

In the diamond industry there are many loose diamonds that are graded on a diamond scale. A diamond scale provides information about loose diamonds such as the color, clarity and diamond cut. These diamond scales are provided by gemological laboratories that are specialist in grading loose diamonds. One of those gemological laboratories is the GIA. World’s most appreciated and well known diamond grading laboratory since they are very accurate, reliable and trustworthy.

From all the diamond scales that are available for a diamond grading report, diamond color scale, diamond clarity scale and diamond cut scale are the most important to measure the value of the diamond.

Understanding scales for loose diamonds

Every diamond grading report has their own criteria and methods to grade loose diamonds. But these grading methods are all adapted from the largest gemological laboratory in the world, the GIA. Thus, if you want to understand the most universally accepted diamond grading report it is recommended to understand the GIA criteria. Take for example the diamond scale diamond color scale, clarity scale and cut scale.


Diamond color scale

A diamond color scale begins with the letter D, representing the highest color rate. D-color means that the loose diamond is colorless, which is really rare and desirable. After D-color the diamond color scale descends to the letter Z, which means that the diamond has a slight yellowish or brownish color. This is not favorable since colorless diamonds need to be clean. Only colored diamonds will increase in value if the color gets more intense. Colored diamonds are for example, pink, yellow, brown, blue or green diamonds.


Diamond clarity scale

Not every diamond is as clear as the other, some will have inclusions or blemishes. To measure the clarity for loose diamonds, the GIA developed a diamond clarity scale that begins with FL which means flawless (loupe clean). Diamonds that are FL are expensive yet rare since you will not see any inclusions or blemishes, even with a loupe. Diamonds that are internally flawless but have small blemishes on the surface that are visible under a 10x magnification are graded IF. Loose diamonds that are graded with VVS1-VVS2 have very, very small inclusions and VS1-VS2 have very small inclusions. Furthermore, the diamond clarity scale also has small inclusions (SI1-SI2) and I2-I2-I3 which represents a diamond with inclusions that are visible to naked eye.


Diamond cut scale

When a diamond is cut perfectly the light of the diamond will reflect back through the top. But if the diamond is cut too shallow the light will leak through the bottom. With a diamond scale it is possible to grade the diamond cut. The grading scales for clarity are indicated by: excellent, very good, good, fair and poor.


Purchasing a good quality diamond

By understanding the main diamond grading scales it is easier to read a diamond grading report. By looking at diamond grading reports you will get an indication about the quality of the diamond. If the diamond scores high on every diamond scale it is a diamond with high quality. In order to find this perfect diamond you can fill in a free quote. Our wholesale diamond experts will help you source the worldwide inventory of loose diamonds with GIA certification. In addition, it is possible to mount your perfect diamond in a diamond jewelry design you created with our in-house jewelers.



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Step 1: DIAMOND SHAPE: How to choose ?

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STEP 2: DIAMOND SIZE: How to choose ?

Size :
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