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A large group of people outside on GIA’s Carlsbad, California  campus.
Guardians of Trust: GIA’s Innovative Research, Instruments and Services

GIA’s services and instruments have grown in importance and impact as new gem treatments and laboratory-grown gems have entered the market.

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Natural Alexandrite
The Distinction of Natural from Synthetic Alexandrite by Infrared Spectroscopy

A useful way to identify stones that contain no distinguishing inclusions.

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