The Gemological Institute of America (GIA) has launched a project comprised of data collected from gemstones in the Edward J. Gübelin collection, which the institute acquired in 2005. The GIA Gem Project is free to the trade and available online for the general public. Check it out.
Useful links:
www.gia.edu/research-resources/gia-gem-database
www.gubelinlab.com
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