Lapidary.

The word lapidary carries two related meanings, both worth knowing. The older sense names a class of medieval and early modern texts that catalogued stones and described their virtues: their healing powers, their astrological correspondences, their use as talismans, and the legends attached to them. The Latin Lapidarium of Marbode of Rennes (eleventh century) is one of the most influential examples, drawing on classical sources such as Pliny the Elder's Natural History and the Cyranides, and shaping European stone-lore for centuries afterwards.

The second sense names the craft itself: a lapidary is also a person who cuts, polishes, and shapes gemstones. The two meanings sit comfortably together. Both are forms of careful attention to stones.

For modern crystal practice, the medieval lapidaries are useful background. Many of the meanings still in circulation (amethyst for sober thinking, sapphire for celestial wisdom, emerald for foresight) trace directly to these books. Reading a few pages of Marbode or Pliny is a quick way to see how old, layered, and culturally specific the inherited meanings really are. It also makes the modern tradition easier to use thoughtfully.