GIA Diamonds

The Gemological Institute of America (GIA) is a non-profit organization committed to the research and education in the field of gemology and the art of jewelry. They are based in Carlsbad, California. 


Robert M. Shipley established the Gemological Institute of America in Los Angeles in 1931. Their main mission is to protect buyers and sellers of gemstones by putting up standards to evaluate gemstone quality. Through intensive research, the institute is able to identify gemstones and grade diamonds. The institute also offered courses so that one can become a Certified Gemologist.

In 1934, the very first issue of Gems & Gemology was published. Gems & Gemology is a scientific journal published quarterly by the Gemological Institute of America. The journal is dedicated to researching various gemstones, diamonds, and pearls. It also talks about treatments, different identification techniques, geographic sources, and imitation and synthetics. Each issue contains updates from the GIA and other international gemology sources.

In the early 1940s, Robert M. Shipley developed the 4Cs, which are the four factors that help identify a diamond’s value. The 4Cs stands for carat weight, clarity, cut, and color. Years later, Shipley’s successor Richard T. Liddicoat expanded on the 4Cs and the grading scales. In 1953, the GIA published the very first diamond grading report. The report soon became the international jewelry industry’s benchmark for grading diamonds.


The GIA is also dedicated to educating people about gemstones and jewelry. Thus, offering courses in an online platform or through in-person classes through its 12 campus locations worldwide. The GIA offers the following diploma programs such as:

  • Graduate Diamonds
  • Graduate Colored Stones
  • Graduate Gemologist
  • Graduate Jeweler
  • Graduate Pearls
  • Accredited Jewelry Professional
  • Comprehensive CAD/CAM
  • Jewelry Design Course
  • Jewelry Design & Technology

The first Graduate Gemology diploma was given in 1948.

We BUY GIA Certified (Graded) Diamonds

Do you have a GIA certified (graded) diamond that you’re not using anymore and want out of your hands? We’ll be happy to take them from you and even pay you for them! Here at Nevada Coin Mart, we are the #1 buyer of GIA certified (graded) diamonds, in Las Vegas and Henderson, even in the entire Nevada state! 

We offer free in-store evaluation for your piece using a state-of-the-art Thermo Scientific Niton X-Ray Spectrometer in order to accurately analyze and measure precious metal contents in your piece. This will ensure that you get top-dollar for your items. 

We are open 365 times in a year from 9am to 6pm, so come visit us at Nevada Coin Mart® 4065 S. Jones Blvd Las Vegas, NV 89103 or call us up at 702-998-4000.