Please review these valuable pages linked to the Gemological Institute of America's (GIA) informative
Origin of the Diamond 4C's
Until the middle of the twentieth century, there was no agreed-upon standard by which diamonds could be judged. GIA created the first, and now globally accepted standard for describing diamonds: Color, Clarity, Cut, and Carat Weight. Today, the 4C's of Diamond Quality is the universal method for assessing the quality of any diamond, anywhere in the world.
Learn more about buying a diamond with the GIA 4Cs app.
Learn about the 4Cs and how to choose a diamond.