Diamonds and precious stones, a popular account of gems .. (1874)
Dieulafait, Louis, b. 1830, Sanford, Fanchon, tr · New York, Scribner, Armstrong, and Company · leaf 280
Fig. 103.—Natural Octahedral Diamond. The starting point for the modern diamond, asfor the ancient Indian form, is the simple octa- … Fig. 104. Fig. 105. hedron. The following is the method employed informing the octahedron into a brilliant:— 26o PRECIOUS STONES. In Fig. 103 let the line AB which joins the twoopposite summits, be divided into six equal parts,and let a plane perpendicular to the line AB passthrough the second…
Precious stones · Diamonds · Gems
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