GIA RESEARCH

Research is at the heart of everything GIA does. It informs gemstone grading reports, drives innovation in instrument development and fuels our educat

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Gem Characterization

Figure 1. Measuring about 7 cm across, this 404.2 ct rough from Angolas Lulo mine is a good example of the irregular shape and surface texture associated with CLIPPIR diamonds. The unusual characterist...

General Gemology and Jewelry

GEMSTONES AND SUSTAINABLE LIVELIHOODS: FROM MINES TO MARKETS Saleem H. Ali Gemstones and Sustainable Development Knowledge Hub, University of Delaware, Newark Colored gemstone supply chains are highly ...

Gem Localities and Formation

Figure 1. Cobalt-blue gem spinel from Baffin Island, Nunavut, Canada. Photo by Lee Groat. SCIENTIFIC STUDY OF COLORED GEM DEPOSITS AND MODERN FINGERPRINTING METHODS Lee Groat University of British Colu...

Diamond Identification

Figure 1. The canary yellow diamonds from this study showed much lower concentrations of isolated nitrogen than regular type Ib yellow diamonds, which usually show brownish and greenish hues linked to ...

New Technologies and Techniques

Figure 1. Single-crystal CVD diamond. Courtesy of Element Six. SYNTHETIC CVD DIAMOND30 YEARS ON Daniel J. Twitchen Element Six, Global Innovation Centre, Harwell, Oxford, United Kingdom Element Six fir...