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Nicols, Thomas. Arcula gemmea: or, A cabinet of jevvels. : Discovering the nature, vertue, value of pretious stones, with infallible rules to escape the deceit of all such as are adulterate and counterfeit. By Thomas Nicols, sometimes of Jesus-Colledge in Cambridge

Boyle, Robert. Exercitatio de origine & viribus gemmarum. : In qua proponuntur & historicè illustrantur conjecturae quaedam circa materiae gemmarum consistentiam, necnon subjecta, quibus praecipuae earum vires inhaerent. Authore Roberto Boyle, nobili Anglo, è Societate Regiâ