Unusual doublets created from two different synthetics are revealed at the Carlsbad laboratory.
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This section, from the Spring 1991 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.
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A combination of trace-element analysis and UV-visible spectroscopy clearly indicated that the yellow colour originated from the much more effective chromophore known as “trapped holes” associated with the trace amount of Mg and Cr in this stone.
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