Boyle, R. (1672). An essay about the origine & virtues of gems.: Wherein are propos'd and historically illustrated some conjectures about the consistence of the matter of precious stones, and the subjects wherein their chiefest virtues reside. By the Honourable Robert Boyle, Esq; Fellow of the Royal Society. printed by William Godbid, and are to be sold by Moses Pitt at the White Hart in Little Britain.

Boyle, Robert. An Essay About the Origine & Virtues of Gems.: Wherein Are Propos'd and Historically Illustrated Some Conjectures About the Consistence of the Matter of Precious Stones, and the Subjects Wherein Their Chiefest Virtues Reside. By the Honourable Robert Boyle, Esq; Fellow of the Royal Society. printed by William Godbid, and are to be sold by Moses Pitt at the White Hart in Little Britain, 1672.