The World Gemological Institute (WGI) is a nonprofit gemological research center and diamond grading laboratory with over 30 years experience in the diamond industry.

 

The World Gemological Institute is committed to providing accurate, reliable and innovative service to consumers, retailers and diamond manufacturers as the diamond industry moves into the 21^st century and beyond.

 

Dedicated to the highest ethical standards and quality control, the World Gemological Institute’s Diamond Grading Report and Diamond Precis provide the comfort and assurance you need when purchasing a diamond.