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Welcome to GIA Knowledge Sessions

Unusual Phenomenal Colored Stones

DATE: Thursday, September 30th at 10:00 a.m. PDT

From star sapphires to opals to alexandrites, phenomenal gems are nothing short of, well, phenomenal! They each have special properties that allow them to interact with light in an unusual way, causing them to display effects such as asterism, play-of-color and color change. Journey along with GIA researchers Aaron Palke and Ziyin Sun as they dive into the science and mystery of phenomenal gems, nature’s rock stars.
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Dr. Aaron Palke is the senior manager of research at GIA. His research is mainly focused on using inclusions, trace element chemistry and spectroscopy to understand the geological origin of gems.

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Ziyin Sun is a GIA Research Associate. His area of research includes chemical analysis of various colored stones and minerals by LA-ICP-MS and ED-XRF. Colorimetric analysis of different types of chromophores in various colored stones and minerals using UV-Vis-NIR spectra.

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Stuart Overlin is managing editor of Gems & Gemology and joined the journal in 1997. He is a graduate of the U.S. Naval Academy and has a master’s in writing and publishing from DePaul University.

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