GIA is proud to provide the most comprehensive research in the industry with a world-renowned field gemology team and a dedication to acquiring colored stones directly from the source. Our ...
The GIA Laboratory-Grown Diamond Report includes full quality assessment with a plotted clarity diagram. Color and clarity specification are described on the same scale as the GIA Diamond Grading ...
Emeralds are again being mined in the historic district of the Ural Mountains. Physical, chemical, spectroscopic, and microscopic characteristics of stones from the recent production are presented and ...
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The green turquoise cabochon, from an American mine, might become part of a designerâs unique jewelry piece. The even blue color of the cabochon on the right would be called âPersian blueâ in the ...
Diamonds have a long history as beautiful objects of desire. In the first century AD, the Roman naturalist Pliny stated: âDiamond is the most valuable, not only of precious stones, but of all things ...
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Twenty-six peridot samples from the Esquel pallasite meteorite and 27 samples from 10 terrestrial sources were studied by laser ablationâinductively coupled plasmaâmass spectrometry (LAICP- MS). Among ...
This 5.30-carat emerald from Brazil has a slightly bluish green color. Courtesy John Parrish, courtesy African, Brazilian, Colombian Gems Incorporated. Emerald has many special qualities, but colored ...
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