About GIA

Founded in 1931, the Gemological Institute of America (GIA) is the world’s leading and most respected authority on gemology. Operating as a public-benefit, non-profit organization, GIA serves as the primary source of knowledge, standards, and education for the gemstone and jewelry industry.

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Принципи 4C

The 4Cs

GIA created the 4Cs (Carat Weight, Clarity, Color, and Cut) and the International Diamond Grading System™, establishing the universal standard for diamond quality evaluation used by professionals worldwide.

Типи діамантів

Understanding Diamond Varieties

Serious diamond enthusiasts rely on the 4Cs. However, discerning buyers often seek a deeper understanding of diamond types. So, what is a diamond type, and why does it matter when selecting an exceptional gemstone?

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