The Karowe Diamond Mine in Botswana, owned and operated by Lucara Diamond Corp., has gained international recognition for producing large, high-quality type IaB or coexistence of IaB with IIa diamonds ...

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 ...

Through extensive hands-on practice using gemstones, you will explore grading the color, clarity and cut quality of a wide range of colored stones. Coursework includes the study of the GIA Colored ...

GIA’s New York campus is a state-of-the-art facility in the International Gem Tower – right in the heart of the famed Diamond District. The campus is feet away from thousands of businesses devoted to ...

Rough amber sometimes contains assorted plant and insect inclusions. Many are even visible without magnification. Amber is an organic gem. Organic gems are the products of living or once-living ...

Practice the same time-tested procedures and identification skills used by the Institute’s renowned gemological experts. Tools used include a microscope, a refractometer with polarizing filter and a ...

GIA programs and courses are offered year-round on a rolling basis at GIA campuses around the globe. This enables students to jumpstart their gem and jewelry career studies at the soonest, most ...

In November 2022, a parcel of 24 approximately 0.5–1.2 ct spinel crystals, described as cobalt-diffused, were obtained directly from a treater by the research team at GIA in Bangkok. Of these, seven ...

Figure 1. Kiwon Jang checks a cassette of stones during the Jang 1024’s robotic cutting process. Photo by Tao Hsu. At the technology pavilion of the AGTA show, master cutter Kiwon Jang of KLM ...

A handful of black opal harvested at the world capital of fine black opal, Lightning Ridge. Photo by Vincent Pardieu/GIA. Opal was discovered in Lightning Ridge in the late 1880s, but its value was ...