Crystal Healing

Marbod of Rennes's eleventh-century verse lapidary already called amethyst "contrarius ebrietati", opposed to drunkenness. By the fourteenth century it had been translated into French, Provençal, Italian, Irish and Danish.

Marbod of Rennes, Liber lapidum, 'De amethysto', ed. Johann Beckmann (Göttingen, 1799); Wikipedia, 'Marbod of Rennes', on its fourteenth-century translations

Placing crystals and gemstones on or near the body in the belief that they heal body and spirit.

Sources2 sources

Primary source

Marbod of Rennes, ed. Johann Beckmann, Marbodi Liber lapidum seu De gemmis, 1799, 'De amethysto'Marbod's lapidary attributes to amethyst a power against drunkenness.
Hic facilis sculpi, contrarius ebrietati

Where this claim originates

Katrina Raphaell, Crystal Enlightenment: The Transforming Properties of Crystals and Healing Stones (New York: Aurora Press), 1985A founding 1980s practitioner manual of stones matched to chakras and laid on the body.