Press Release

GIA iD100 Achieves Strong Results in Independent Test

The GIA iD100® can distinguish natural diamonds – mounted and loose, rough and cut – from laboratory-grown (HPHT and CVD) diamonds and diamond simulants in the colorless to near-colorless range, in sizes starting from 0.9 millimeters in diameter.

Accuracy, consistency and affordability provide exceptional value

CARLSBAD, Calif. – May 22, 2019 – The GIA iD100® gem testing instrument was highly rated in a second round of testing by third-party testing laboratory UL as part of the Diamond Producers Association (DPA) Assure Program, an effort to systematically evaluate devices for separating natural diamonds, laboratory-grown diamonds and diamond simulants.
The DPA study released on May 19 confirmed again that the GIA iD100 is 100% accurate in referring all potential laboratory-grown diamonds and simulants for further testing. In this second round of UL testing following additional training and guidance provided to the UL technician by GIA staff, the instrument attained a ‘diamond accuracy rate’ of 96.7 percent and a ‘diamond refer rate’ of 3.3 percent. These results replace the earlier results published by the Assure Program as they better reflect the performance of the iD100 when used with adequate guidance and training.
“This report confirms what GIA and our many clients who depend on the iD100’s accurate and consistent results already know,” said Tom Moses, GIA executive vice president and chief laboratory and research officer. “The iD100’s strong performance and accessible price provide value for the industry.”
“Proper use of the iD100 is very important,” said Dr. Wuyi Wang, GIA vice president of research and development. “Appropriate ambient lighting and correct placement of the instrument’s spectroscopic probe yield the most accurate and consistent results.”
The robust capabilities of the iD100 are the result of GIA’s decades of scientific research into natural (since the 1930s) and laboratory-grown diamonds (since the 1950s), and the expertise of the diamond geologists, physicists and other experts who designed it.
The iD100 costs US $4,995 and can be ordered online at Orders for delivery in the United States can be shipped within one business day after payment. More information, including a detailed user guide (available in seven languages) and training videos, can be seen at GIA customer support can provide additional training; please contact The device will be available for order and demonstrations at the May 31 – June 3 JCK Las Vegas trade show at the Sands Expo & The Venetian; visit GIA at booth 18019 or check for more information.
Results of the Project Assure testing of the iD100 are available at

About GIA

An independent nonprofit organization, GIA (Gemological Institute of America), established in 1931, is recognized as the world’s foremost authority in gemology. GIA invented the famous 4Cs of Color, Clarity, Cut and Carat Weight and, in 1953, created the International Diamond Grading System™ which is recognized around the world as the standard for diamond quality.
Through research, education, gemological laboratory services and instrument development, the Institute is dedicated to ensuring the public trust in gems and jewelry by upholding the highest standards of integrity, academics, science and professionalism.