GIA remains the world's foremost authority in gemology, leading in scientific research and setting the ethical benchmark for the entire industry. The presence of a GIA report is universally recognized as the highest standard of consumer confidence and product integrity.
After over 15 years of research, GIA released its definitive diamond cut grading system for standard round brilliants, solidifying the system as a global benchmark.
GIA began issuing formal grading reports, providing an objective, scientific analysis of a diamond's quality based on the new system.
GIA created the International Grading System by formalizing the 4Cs and introduced the D-to-Z color scale (to avoid confusion with prior, inconsistent "A" grades) and the Flawless-to-I3 clarity scale.
Shipley began teaching his students the 4Cs (Cut, Color, Clarity, and Carat Weight) as a simple, memorable mnemonic to standardize diamond quality factors.
GIA patents the first gemological microscope. Gemologists are able to examine the interior of gems.
Established by Robert M. Shipley, GIA is founded as a nonprofit institute dedicated to research, education, and professionalization of the jewelry trade.
