The Gemological Institute of America (GIA)

The Gemological Institute of America (GIA) is a global leader in gem research, education, and grading services. It is best known for its precise and consistent evaluation of gemstones, especially diamonds, by analyzing their quality based on the 4 Cs: cut, color, clarity, and carat weight. GIA also provides education programs for industry professionals and consumers, and issues reputable gemstone grading reports that help buyers and sellers make informed decisions. Its standards are trusted worldwide, making GIA a key authority in ensuring gemstone authenticity and quality.