Diamonds and precious stones, a popular account of gems .. (1874)
Dieulafait, Louis, b. 1830, Sanford, Fanchon, tr · New York, Scribner, Armstrong, and Company · leaf 211
hope from this method. Evenadmitting that mother-of-pearl and pearl are thesame in composition, which has not been scienti-fically proved, it is certain that they are not of thesame constitution. Mother-of-pearl is much harder,and offers infinitely more resistance to the tools ofthe lapidary than… … Fig. 84.—Pearl. Fig. 85.—Mother-of-pearl. Figs. 84 and 85 establish perfectly to the eye thecomplete difference presented in this respect bymother-of-pearl and the pearl. THE PEARL. TQI They show, at the same time, how the light mustnecessarily undergo very different modifications inthe two cases,…
Precious stones · Diamonds · Gems
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