Martin Steinbach: “An Overview of Asteriated Gems” 

This video is from the Research Track of the 2018 GIA International Gemological Symposium. The Research Track presented the latest findings by Institute researchers and scientists respected across the industry and from around the world.
This presentation is part of the theme, Colored Stones and Pearls. Synthetic and treated colored stones and pearls are widely available. Although standard gem-testing equipment can be used to help identify these materials, the use of advanced scientific instrumentation is increasingly necessary. Country-of-origin determination for various species of colored stones requires documentation of visual, spectroscopic and compositional features, which are then compared to similar gem materials from a known geographic source. Presentations may include, but are not limited to, identifying natural, treated and synthetic colored stones, the characterization of colored stones from specific localities, and natural and cultured pearls.
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