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Use this "A Students’ Guide to Spectroscopy" in conjunction with the OPL Spectroscope. That tool does not come with instructions per se, so you may want this book for at least that. But more to the point, this guide includes the color spectrums for the main gem species, so that you can match up what you see through the scope, with the corresponding gem.
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I own Anderson and Payne's "The Spectroscope and Gemmolgy book which is "The Source" with it's history, theory and applications.Learning for me is easier when see the actual colors and the OPL Students Guide does a good job for me.
Thank you for having it available.
Jeff D. Jeff Dolson on Feb 20th 2023
excelent, good topic review. adolfo on Jan 10th 2022