GIA vs. IGI Certified Diamonds — What's the Difference?

When shopping for a diamond, you'll frequently encounter certificates from GIA (Gemological Institute of America) and IGI (International Gemological Institute). Both are reputable grading organizations, but there are important differences to understand. Here's a complete breakdown to help you make an informed decision at Gallo Jewelry.

What Is Diamond Certification?

A diamond certificate (also called a diamond grading report) is an independent assessment of a diamond's quality and characteristics. It documents the 4 Cs (Cut, Color, Clarity, and Carat), as well as additional measurements, fluorescence, and other details. A certificate protects you by providing an unbiased third-party verification of the diamond you're purchasing.

GIA: The Gold Standard

Founded in 1931, the Gemological Institute of America is widely regarded as the world's most respected and authoritative diamond grading laboratory. GIA created the 4 Cs grading system and is known for its extremely consistent and conservative grading standards.

GIA-certified diamonds are graded to the strictest standards in the industry. When a diamond is graded GIA, you can be confident the grade is accurate and will be recognized by jewelers and insurers worldwide. At Gallo Jewelry, all our natural diamonds come with GIA certification.

IGI: The Lab-Grown Diamond Standard

The International Gemological Institute (IGI), founded in 1975, has become the leading certification laboratory for lab-grown diamonds. As lab-grown diamonds grew in popularity, IGI invested heavily in developing expertise for these stones.

IGI grades both natural and lab-grown diamonds and is widely trusted in the industry. IGI tends to grade slightly more generously than GIA for natural diamonds, meaning an IGI-graded stone may carry a slightly higher grade than the same stone would receive from GIA. At Gallo Jewelry, all our lab-grown diamonds come with IGI certification.

Which Certificate Should You Choose?

• For natural diamonds: GIA is the gold standard. An GIA-certified natural diamond provides the most trustworthy and universally recognized grading.
• For lab-grown diamonds: IGI is the industry leader and provides excellent, reliable certification.

At Gallo Jewelry, we make the decision easy — our natural diamonds come GIA-certified and our lab-grown diamonds come IGI-certified, so every purchase is fully documented and guaranteed. Explore our certified diamond collection.