The rapid exhaustion of the first edition, and the numerous demands for more copies, having proved to the Author that, contrary to his expectation, a plain and unvarnished statement of facts connected with precious stones has proved interesting not only to the trader in gems, and to the amateur in mineralogy, but to the general public he has been emboldened to publish another edition, in which he has made several important corrections and additions which have been necessitated by the course of events.