Established in 1931, GIA is the world’s foremost authority on diamonds, colored stones, and pearls. A public benefit, nonprofit institute, GIA is the leading source of knowledge, standards, and education in gems and jewelry.
Students around the globe turn to GIA for the knowledge, skills, and credentials that launch successful gem and jewelry careers.LEARN MORE
The world leader in gemological research, GIA’s breakthrough discoveries deepen our understanding of gemstones and the world.LEARN MORE
Through research, education, and unbiased gem grading and analysis, GIA strives to protect the gem and jewelry buying public by setting global quality standards.LEARN MORE
Since the 1930s, GIA researchers have made many innovative contributions to the understanding of gems.
Robert M. Shipley establishes GIA; opens first U.S.-based gemology correspondence course.Learn More
Home-study courses introduced, leading to the professional designation: Certified Gemologist.
Shipley publishes first issue of Gems & Gemology. Gemology becomes a recognized science.
GIA patents a loupe with triple aplanatic lens: The modern professional jeweler’s loupe is born.Learn More
GIA patents the first gemological microscope. Gemologists are able to examine the interior of gems.
Richard T. Liddicoat joins GIA. Known as the “father of modern gemology” for contributions to gems, jewelry.
G. Robert Crowningshield joins GIA. Named VP of GIA Gem Trade Laboratory in New York shortly after.
The first edition of Liddicoat’s Handbook of Gem Identification published; 11 editions follow.
The first Graduate in Gemology diploma is issued.
GIA NY laboratory offers pearl identification service.
Liddicoat’s International Diamond Grading System, based on Shipley’s 4Cs, becomes universal standard.
GIA issues first diamond grading reports; they become the international jewelry industry’s benchmark.
Crowningshield accomplishes groundbreaking work in the detection of gem treatments through the use of the spectroscope.
The GIA Diamond Dictionary - which quickly becomes the international industry reference – is published.
GIA courses accredited by National Home Study Council (now the Distance Education Training Council).
GIA courses translated and taught in Japan
On-campus classes accredited by National Association of Trade and Technical Schools.
Gems & Gemology is redesigned, printed in full color, and goes on to win 15 awards for excellence during the next 20 years
GIA Celebrates its 50th Anniversary with the first International Gemological Symposium
The GIA Alumni Association is established.
Liddicoat Gemological Library and Information Center acquires world’s largest collection of gemological books.
GIA grades the famous 45.52-carat Hope Diamond.
GIA opens school in Korea; others follow in Europe, Asia and India.
GIA hosts first annual Career Fair - the industry’s preeminent recruiting event.
Gems & Gemology publishes groundbreaking article on identifying synthetic diamonds.
GIA opens Robert Mouawad Campus as its global headquarters in Carlsbad, CA.
Robert M. Shipley (1887-1978) named Person of the Century by JCK magazine.
GIA, De Beers researchers identify criteria for High Pressure/High Temperature processed diamonds.
GIA identifies beryllium-diffused sapphires and rubies and chemical vapor deposition (CVD) synthetic diamonds.
GIA introduces a cut grade for round brilliant diamonds in the D-to-Z color range.
GIA introduces Synthetic Diamond Grading Report.
GIA creates 4Cs and International Diamond Grading System™ materials for consumers.
GIA opens laboratories in Mumbai, Johannesburg and Gaborone.
GIA offers gemology courses entirely online.
GIA offers interactive 4Cs app for consumers.
GIA opens laboratories in Tokyo and Ramat Gan, Israel.
Susan Jacques becomes GIA’s sixth President and CEO
GIA Develops DiamondCheck to differentiate natural from treated and synthetic diamonds
GIA Inaugurates New York Laboratory and Education Facility
In the 1940s, GIA established the “4Cs” and the International Diamond Grading System™ – to this day, the worldwide standard for evaluating diamond quality.
The sparkle and brilliance of a diamond depends more on its cut than anything else.Learn More
The absence of inclusions and blemishes makes a diamond rare and affects value.Learn More
Diamonds in the D-to-Z color range are valued by how closely they approach colorlessness – the less color, the higher their value.Learn More
Diamonds and gemstones are weighed in metric carats: one carat is equal to 0.2 grams, about the weight of a paperclip.Learn More