Acclaimed Diamond Grading Companies Unveiled

The world’s leading diamond grading companies are organizations that specialize in the evaluation and certification of diamonds based on their quality and value. These companies are highly respected in the industry and are known for their expertise and rigorous grading standards.

A List Of Diamond Grading Companies

Click the links to learn more about them, including their history.

To view our ranking of diamond grading companies, click here.


One of the leading diamond grading companies is the Gemological Institute of America (GIA), which was founded in 1931 and is headquartered in New York City. The GIA is renowned for its Diamond Grading System, which is widely considered to be the industry standard for evaluating diamonds. The GIA grades diamonds on a scale from D to Z, with D representing the highest level of quality and Z representing the lowest.


Another leading diamond grading company is the International Gemological Institute (IGI), which was founded in 1975 and is headquartered in Antwerp, Belgium. The IGI is known for its Diamond Certificate, which is a detailed report that provides information on a diamond’s cut, color, clarity, and carat weight. The IGI also offers a variety of additional services, such as diamond identification and laser inscription.


The American Gem Society (AGS) is another well-known diamond grading company, founded in 1934 and headquartered in Las Vegas, Nevada. The AGS is known for its Diamond Quality Document, which provides a comprehensive evaluation of a diamond’s quality and value. The AGS also offers a range of other services, including diamond grading and appraisals, as well as education and training programs for industry professionals.


EGL, or the European Gemological Laboratory, is a diamond grading organization that was founded in Antwerp, Belgium in 1974. EGL is one of the leading gemological laboratories in the world and is known for its expertise in diamond grading and certification.


HRD, or the Hoge Raad voor Diamant (High Diamond Council), is a diamond grading organization based in Antwerp, Belgium. Founded in 1973, HRD is one of the most respected and renowned diamond grading organizations in the world, and is recognized for its high standards and rigorous grading criteria.

Trusted And Respected

The world’s leading diamond grading companies are highly respected organizations that play a crucial role in the industry by providing expert evaluations and certification of diamonds. Their rigorous grading standards and comprehensive services help ensure that consumers have access to accurate and reliable information about the quality and value of their diamonds.

Why It Is A Good Idea To Purchase Your Diamonds Certified

Having a certificate for your diamond issued by an internationally recognized diamond grading company is important for a number of reasons:

  1. It provides an independent assessment of the diamond’s quality: A certificate issued by an internationally recognized diamond grading company provides an objective assessment of the diamond’s quality. It includes information about the diamond’s characteristics, such as its cut, clarity, color, and carat weight, which can help you understand the value and rarity of the diamond.
  2. It serves as a record of the diamond’s characteristics: A certificate is a permanent record of the diamond’s characteristics, which can be helpful if you need to prove the authenticity or value of the diamond in the future. It can also be useful if you ever need to insure the diamond or have it appraised.
  3. It can increase the diamond’s resale value: A certificate from an internationally recognized diamond grading company can increase the resale value of the diamond. This is because buyers are more likely to trust the authenticity and quality of a diamond that has been certified by a reputable organization.
  4. It helps to protect against fraud: Buying a diamond without a certificate from an internationally recognized diamond grading company can increase the risk of purchasing a fake or low-quality diamond. A certificate helps to protect against fraud by providing an independent assessment of the diamond’s characteristics.

Sometimes, You Can Also Trust A Diamond Expert Without Certification

In exceptional situations, it may be possible to trust the grading of a diamond by an especially established jeweler or diamond dealer. However, it is important to note that in general, the most reliable and accurate way to grade a diamond is to have it evaluated by an internationally recognized diamond grading company. These companies have strict grading standards and use specialized equipment to accurately assess the quality of diamonds.

An especially established jeweler may have a high level of expertise and experience in grading diamonds, and may be able to accurately assess the quality of a diamond based on their knowledge and expertise. However, there is still a risk of subjectivity or bias when relying on the grading of a single individual, even if they are an experienced and reputable jeweler.