Diamond Inhouse

Introduction to IGI diamond report:

International Gemological Institute (IGI) is one of the largest Independent Laboratories and one of the trusted laboratories in the world known for diamond testing, grading, jewelry certificates, and gemstones certificates, etc.


How to analyze the IGI Diamond Report or Certificate?

A diamond certificate or report has every small detail which is required to understand the diamond. These details will help the people who want to buy diamonds but for that they need to first understand the reports. What things to look out for. As, they look at the certificate, they don’t know how to read it or what all things to analyze in it. So, this blog gives you a helpful idea and guidance to read the report.

For better understanding, we are taking the sample of Diamond Certificate from the International Gemological Institute, IGI.



Let’s start with the understanding of the report:

1. Date

The date can tell us several different things. These details help us to judge the diamond. Is it brand new or graded which year? It helps in deciding what and which diamond to take. Its not bad to repurchase but only if the Diamond comes back in the best conditions.

2. IGI Report number

Every report has a unique number and you can also view it from the IGI website. The Buyer can check the authentication of the report which is provided to them. 

3. Description

The description provides information about the reality of the stone like it is a natural diamond, it is CVD or lab-grown diamond, etc.

4. Shape and cutting style

As the people generally take the shape and cutting style as the same but these 2 things are different. The shapes are round, pear, square, oval, etc. (click the link to know more about diamond shapes). There are different cutting style available like the Single cut, Brilliant cut, etc. 

5. Diamond measurement

When it comes to measurements, Diamond’s proportion and size are explained in the reports. It can be seen is the diamond is close to Ideal measurements and it will help in taking quick decisions just by comparing the mm sizes.

6. Carat weight

The Carat Weight explains how much is the weight of the Diamond. To see the carat table or chart of the carat weight, you can go and read here. The weight system is also called in points. Like:

0.25 CARAT = 25 POINTS

0.50 CARAT = 50 POINTS

0.75 CARAT = 75 POINTS


7. Diamond Color Grade

The Color Grade refers to the type of color or shades which exist in the Diamond. If you want to understand more clearly about the color shades, you can click here.

8. Diamond Clarity grade

The clarity grade shows how many flaws contain in the diamonds. This is also shown by the chart called Diamond Plot, where the flaws are shown by the marking. To know more about clarity, you can read this blog.

9. Diamond cut grade

The diamond cut grade shows 5 categories:



  3. GOOD

  4. FAIR

  5. POOR.

The diamond cut grading considers the factors like table size, culet girdle thickness, etc. If you wish to understand more about the diamond Cut grades, you can read here.

10. Polish

It means that the facets of the diamond are smoothly and perfectly polished. If any Facet has been over polished or less polished or marked with flaws, they can alter light and even make your diamond look less shiny. Light can reflect off from these flaws and can create a dull impact.

11. Symmetry

Symmetry refers to how closely the same kind of Facets is proportionate. Like Star Facets should all be perfectly identical, they should all match up and look similar.

12. Fluorescence

Fluorescence means the diamond has a Milky or Cloudy inclusion which makes the diamond looks dull in natural light. Even if that Diamond does not have any Flaws in it, that is a Diamond with white Color and an Excellent Cut. The diamond will glow when kept under UV light. We have explained in detailed in our different blog, if you wish to read more, click here. 

13. Inscription

The meaning of the inscription here is a Laser Inscription number, which means that the numbers will be written on the boundaries or the girdle of the diamond. With the help of diamond tools, you can see the numbers and identify the diamond correctly. The Laser Inscription for the Diamond Report as shown is “IGI…  “.

14. Proportions

The diagram shows the actual proportions of the diamond i.e. table size, width size, girdle thickness. Etc. This helps us to understand if the diamond is ideal for buying with the ideal proportion of diamonds.

15. Clarity characteristics

The inclusions in the diamond are shown in the following diagram of the diamond. The inclusions are shown exactly at the same point in the diagram where it exists in diamonds. This helps to easily locate the inclusions in the diamond.


However, there are many other institutions that provide the diamond certificates like AGS, IGI, GIA, and many others. The reading and understanding of the certificate might be different but the overall categories will be the same. We will try to explain all other diamond institution’s certificates as well in some other blogs.


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