Diamonds and precious stones, a popular account of gems .. (1874)
Dieulafait, Louis, b. 1830, Sanford, Fanchon, tr · New York, Scribner, Armstrong, and Company · leaf 306
res twisted together,and impregnated with diamond-dust. This method,however, is both tedious and irregular, and henceinstruments, infinitely more rapid and precise, havebeen substituted for the bow. Fig. 125 represents the mill of the lapidary, withthe polishing disk replaced by a steel disk with… … MB-À ENGRAVING OF PRECIOUS STONES. 28/ and keeps always supplied to the edges of thewheel. This work is usually performed by thelapidary, preparatory to the engravers task; indeed,the stone is sometimes set by the jeweller before it
Precious stones · Diamonds · Gems
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