The Photoatlas is fundamentally a compendium of photomicrographs of inclusions in gemstones organized and described in a fashion to enhance the gemologist’s skills at identifying and interpreting such inclusions. The second volume proceeds from an earlier volume that was published in 1986, and fundamentally updates the older volume to 2005. This volume, the third, focuses on the so-called “precious stones”—diamond, ruby, emerald, and sapphire, but with significant additions relating to “treated” gems and synthetics (both of the actual species as well as simulants). Eduard Gübelin, a dean of the gemological community (deceased in 2005), and John Koivula, a renowned gemologist...

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