A GIA Diamond Grading Report is the benchmark for expert diamond grading and the best way to ensure accuracy in your next diamond purchase.

At GIA, every diamond evaluation is handled with the same care, expertise and strict guidelines. GIA offers the world’s most rigorous assessment of the 4Cs​.

There are several ways that diamonds can be treated to enhance or remove their color and improve their clarity. Every GIA grading report lists the presence of any known diamond treatments.

GIA’s 4Cs transformed the way diamond quality is determined and communicated, forever changing how diamonds are evaluated, bought and sold. The 4Cs are for everyone. This framework is both a way to better understand your diamond, and to ensure accuracy in the evaluation of your diamond’s unique characteristics.

Regardless of which diamond you choose, every purchase should start with accurate information. A GIA diamond grading report ensures that you know exactly what you are buying.

Purchasing a diamond simulant, moissanite or laboratory-grown diamond can be a great option as long as it is an informed decision. Every GIA report scientifically tests each stone to make sure that it is in fact a diamond.

Carat measures weight, not size. A metric Carat is defined as 200 milligrams. Each carat is subdivided into 100 points, allowing for measurement to the hundredth decimal place.

GIA wrote the book on diamond grading. Color, Clarity, Cut, Carat Weight. Today, the 4Cs scientifically ensure public trust in our industry.