What Diamond Labs can I Trust?

It is important to choose a reputable lab when getting your diamond graded. A good lab will use strict grading standards and have a good reputation for accuracy and consistency. You should also consider the specific needs of your purchase. For example, if you are buying a very expensive diamond, you may want to choose a lab with a global reputation, such as IGI or GIA.

Diamond Answers recommends the following labs and their Natural or Lab Grown Diamond certificates:

International Gemological Institute (IGI)

Widely considered one of the most respected and trusted diamond grading labs in the world. IGI has strict grading standards and a global reputation for accuracy and consistency. They offer competitive pricing and fast turnaround times, IGI is one of the oldest labs with the most locations around the world. IGI is one of the first labs to grade Lab Grown Diamonds.

Find a Trusted International Gemological Institute (IGI) Jeweler


Regions: Africa Asia Europe North America South America

Gemological Institute of America (GIA)

Established in 1931, the Gemological Institute of America (GIA) certifcates are trusted when grading diamonds. A nonprofit institute, GIA is a great source of knowledge, standards, and education in diamonds.

Find a Trusted Gemological Institute of America (GIA) Jeweler


Regions: Africa Asia Europe North America South America

HRD Antwerp

HRD Antwerp , Established in 1973 as the ‘Diamond High Council’, at the initiative of the Belgian government and diamond industry representatives, is intertwined with the history of the Antwerp World Diamond Centre (AWDC). HRD Antwerp’s European legacy and years of experience make it an industry leader.

Find a Trusted HRD Antwerp Jeweler


Regions: Europe

Gem Certification & Assurance Lab (GCAL)

GCAL has very high standards, and grades their Diamonds somewhat differently than other laboratories. utilizes a unique quality control procedure for grading the color and clarity of diamonds that assures the most accurate and consistent grading possible. At least three experienced gemologists examine and grade both the color and the clarity of every diamond.

Find a Trusted Gem Certification & Assurance Lab (GCAL) Jeweler


Regions: North America

Gem Science (GSI)

The GSI laboratory is the genesis of GSI’s success. All that GSI is and all that it has accomplished started there. As the only major gem lab established in the 21st century, GSI is uniquely equipped to address continually emerging and accelerating industry challenges. 

Find a Trusted Gem Science (GSI) Jeweler


Regions: North America
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