The Keeping of Stones: Says Who?

Field notes

The book separates two kinds of questions that crystal references commonly blend together: who made a claim and what the object can physically withstand. Its source method is illustrated through four attributions for amethyst, including Pliny in AD 77 and a 1912 jewelers’ convention, while the material section uses Mohs hardness and named hazards to explain water, salt, and sunlight damage. Appendix A records sources by author, work, and date, marking public-domain items for easier checking.