The International Institute of Diamond Grading and Research has laboratories in three global locations, Antwerp, Surat and Maidenhead. Each location provides first class services in diamond grading and testing.
These facilities provide first class services in diamond grading and testing. At all of our facilities, our experts use comprehensive analysis using a variety of different in-house and proprietary equipment to ensure that every diamond we assess is naturally occurring and untreated.
Consumer confidence is at the heart of everything we do. Our fundamental promise of accuracy, knowledge and expertise allows us to confidently stand by our results. Over 125 years of industry expertise ensures the quality of our service is the best in the business.
The International Institute of Diamond Grading & Research's grading standards, fees and procedures are available for you to download for free below. These will give you a comprehensive overview of our grading services, the charges and the procedures on how to submit diamonds to one of global laboratories.