IGL

Grading System

How does IGL grade diamonds ?

People from all over the world send their diamonds to the IGL Laboratory for grading and analysis. Our clients put their business in our hands and their trust in our expertise – and we are extremely careful with both.

Diamond Grading Process

From the moment a diamond is entrusted into our hands, until the moment it is returned back to the client, it is handled and assessed with the utmost care, security and expertise by our team of highly-trained gemologists and support staff. Using state of the art instruments and industry respected grading procedures, the IGL laboratory identifies, assesses and grades each diamond according to the strict standards to which we are committed.

Eight-Step Grading Process

1. ?Registration

As soon as a diamond is submitted to our laboratory, it is weighed and measured, and then assigned with an identification number. This identification number replaces all client information in order to ensure unbiased, objective grading. The client is provided with a receipt stating the identification number, initial weight and the measurements of each diamond submitted.

2. Identification

As soon as a diamond is submitted to our laboratory, it is weighed and measured, and then assigned with an identification number. This identification number replaces all client information in order to ensure unbiased, objective grading. The client is provided with a receipt stating the identification number, initial weight and the measurements of each diamond submitted.

3. Weighing and Measuring

As soon as a diamond is submitted to our laboratory, it is weighed and measured, and then assigned with an identification number. This identification number replaces all client information in order to ensure unbiased, objective grading. The client is provided with a receipt stating the identification number, initial weight and the measurements of each diamond submitted.

4. Cut Grading

As soon as a diamond is submitted to our laboratory, it is weighed and measured, and then assigned with an identification number. This identification number replaces all client information in order to ensure unbiased, objective grading. The client is provided with a receipt stating the identification number, initial weight and the measurements of each diamond submitted.

5. Clarity Grading

As soon as a diamond is submitted to our laboratory, it is weighed and measured, and then assigned with an identification number. This identification number replaces all client information in order to ensure unbiased, objective grading. The client is provided with a receipt stating the identification number, initial weight and the measurements of each diamond submitted.

6. Color Grading

?Each diamond’s color is graded by at least three gemologists in a controlled environment. The color grade is based on a scale of D (colorless) to Z (light amounts of color).

7. Certificate Issuance

After the grading process is completed, your diamond reaches our documentation station, where we print a Diamond Grading certificate or Diamond Précis indicating all grading results. At this point, the grading results can be accessed electronically by the client through our online account management system.

8. ?Laser Inscription

Only after the first seven steps of the grading process have been completed is the diamond sent for laser inscription. If a Diamond Précis was ordered for the diamond, it will have the identification number laser-inscribed on its girdle. The inscription number is the same as the ID number on the diamond’s certificate. For a small additional fee, diamonds receiving an IGL Diamond Grading certificate may also have their ID number laser inscribed on the its girdle. Additionally, all diamonds may receive an inscription of a specific brand or company name or a personal message for the customer. (This service is considered as extra service and not include in the IGL basic grading service pack.)

See also