Certification

Diamonds and gemstones of similar appearance can have important differences in value. An IGI Certificate clearly discloses the details of any item it accompanies, providing confidence for both buyer and seller.

School of Gemology

Whether you want to become a more confident buyer, a diamond grader, jewelry designer, sales professional or Graduate Gemologist, IGI's worldwide schools offer an unrivaled range of coursework.

ABOUT IGI

IGI's supreme position in the gemological world is no coincidence. It is the result of continuous research, support and synergy with professionals and consumers alike.

Understand 4Cs of Diamond Quality

 In most diamonds, the term actually refers to the absence of color. The less color in the stone, the more desirable and valuable it is. Some of these differences are not visible to the naked eye, but directly impact the overall quality and price of the stone.