Gemological Institute of America (GIA)

Founded in 1931, the GIA is one of the foremost organizations in the world in grading and evaluating diamonds and gemstones. The nonprofit organization runs one of the most prestigious gemological grading laboratories in the world and is considered the leading source for information, education, and standards related to both gems and jewelry.  GIA created the 4C’s of diamond grading in 1940, which is still used today as the standard means by which diamonds are evaluated for quality.

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