CARLSBAD, Calif. – June 2, 2025 – Beginning later this year, GIA (the Gemological Institute of America) will start using descriptive terms to characterize the quality of laboratory-grown diamonds and ...

Carbonado diamond is found only in Brazil and the Central African Republic. These unusual diamond aggregates are strongly bonded and porous, with melt-like glassy patinas unlike any conventional ...

Dr. Gao is a research group leader of the National Gems & Jewellery Technology Administrative Center (NGTC) and director of the application R&D department at the Shenzhen Research Institute, NGTC. Ms.

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The quarterly journal of the Gemological Institute of America.

With a reach that spans the globe, GIA is a nonprofit institute dedicated to protecting consumers by ensuring their trust in gems and jewelry through cutting edge gemological research, rigorous ...

Field reports, videos, photography, and firsthand accounts from mines and industry hot spots around the world.

Download the latest issue for articles about gemology and jewelry design, interviews, education program descriptions, schedules and more.

Spinel is a good candidate for the title of “History’s Most Underappreciated Gem.” Some ancient mines that supplied gems for royal courts from Rome to China produced spinel, but it was usually ...

Madagascar has become one of the world’s top sources of fine blue sapphire in recent times. In addition to beautiful untreated material, increasing numbers of treated stones have appeared in the ...

Learn about the differences – and similarities – between natural and laboratory-grown diamonds, and how GIA’s researchers and grading laboratories can tell the difference ...

Christopher M. Breeding, Sally Eaton-Magaña, and James E. Shigley ...