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. It proceeds from an earlier volume published in 1986, and it is followed by volume 3 that is focused on the so-called precious stones: diamond, ruby, emerald, and sapphire. Eduard Gübelin, a dean of the gemological community (deceased in 2005), and John Koivula, a renowned gemologist and inclusion expert at the Gemological Institute of America (GIA), are indeed the experts in this field, so the book is a testament and proof...

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