Diamonds and precious stones, a popular account of gems .. . Fig. 98.—Cubic System. Fig. 99.—Regular Octahedron. derived forms ; and when the cutting of diamondsbecame known in the Indies, it was necessarily dia-monds of this class that had to be operated Figs. 100 and toi.—Common Forms of the Diamond. Accordingly, when we examine the figures of ancient Indian diamonds given by Tavernier and Bernier, we find that the primitive style of cutting in India was to take an octahedron, replace one of 17 258 PRECIOUS STONES. the points by a plane perpendicular to the axis,treat the opposite poi
Diamonds and precious stones, a popular account of gems .. . Fig. 98.—Cubic System. Fig. 99.—Regular Octahedron. derived forms ; and when the cutting of diamondsbecame known in the Indies, it was necessarily dia-monds of this class that had to be operated Figs. 100 and toi.—Common Forms of the Diamond. Accordingly, when we examine the figures of ancient Indian diamonds given by Tavernier and Bernier, we find that the primitive style of cutting in India was to take an octahedron, replace one of 17 258 PRECIOUS STONES. the points by a plane perpendicular to the axis,treat the opposite point in the same way, but so asto have a plane much smaller than the first, andthen cut four bezels round the principal face. When the art of splitting became known, andit was possible by this process to obtain with easeflat-shaped diamonds of considerable size, the orien-tals took a fancy to stones of this kind, with their
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectgems, booksubjectprec
