Written by a gemologist/jeweler, Gems in Myth, Magic and Lore, combines minerological information with a comprehensive review of gemstone lore. Knuth begins the book with a succinct, but comprehensive, review of the history of gemstone lore as it coincides with the rise of gemology as a field of scientific study.
The second part of the book details 46 of the most common gemstones. Each gemstone entry includes a large photograph of the stone, minerological information and the gemstone lore. The lore is presented very respectfully with an acknowledgment that we do not know everything and that there are factual bases to many of these beliefs. As a bonus, there are numerous, well referenced footnotes for each of the stones.
In the third part of the book, he includes information that I have not found elsewhere such mythological gems and gems in literature. There is even a compete copy of a famous Lapidarium writen in the Middle Ages. This section also has some very useful and well done charts detailing things like birthstones through the ages and the significance of gemstone shape.
In my work as a jewelry designer, many of my customers ask my advice about which stones they should use for different forms of protection or as an aid to achieve their goals. In order to help them, I began researching gemstone history and lore. I have now read about 15 books on the subject and I have found that many of them offer contradictory explanations and/or information that is too general or too vague to be of much use. For my purposes, Knuth's book has been the most helpful.