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A practical manual for practitioners working with jewels that is organized in four treatises covering the most prized hard gems, softer rock-based jewels, coarser material varieties, and mineral stones used in ornamentation. It offers hands-on guidance for recognizing and grading pearls, discusses theories of their formation, and enumerates common shapes, sizes, colors, and defects. The text advises on testing, cleaning, and valuation, notes curious or irregular specimens, and summarizes traditional beliefs about the virtues of certain stones for travelers, while emphasizing that the account draws on practical experience rather than learned authorities.
Molti sono d'opinione, che questa pietra ò Gioia, sij la matrice, del Smeraldo, la qual pietra, e pregna di colore in modo tale che è sempre sorda, in un color verde mà smarito, dove si trovano li Smeraldi, si trova anch'essa questa pietra, non è di gran stima non se ne fà gran capitale, se non sono li Medici, che la stimassero per qualche virtù in quanto à Gioilieri, e Orefici, non ne fanno troppo conto.