GIA wants you to understand exactly what you're buying when shopping for your diamond. As creators of the 4Cs and the International
Diamond Grading System, GIA set the standards for diamond grading and has been helping consumers make educated diamond buying decisions
for over 50 years.
GIA's D-to-Z color-grading scale, Flawless-to-I3 clarity-grading scale, and Excellent-to-Poor cut-grading scale are recognized by gem and jewelry professionals everywhere. And, by extension, the GIA Diamond Grading Report, Diamond Dossier®, and Gemological Identification Report are considered to be the world's premier evaluations of gem quality and authenticity.