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Ch. 4: The Cutting of Gems

Ch. 4: The Cutting of Gems Page of 311 Ch. 5: Imitation Gems & Artificial Production Text size:minus plus Restore normal size   Mail page  Print this page
66                                 PRECIOUS STONES.
frequently attacks and carries off the workers in their prime.
Gem stones may be bored by a fine diamond-tipped drill, or by a small steel drill dressed with diamond-dust and olive oil, and made to rotate at a high speed.
In the processes of cutting and polishing, a rough gem will lose 50 per cent, of its weight, or more if a large stone, or 40 per cent., more or less, in small stones; when the rough gem is nearly the form required, as in the case of an octahedral Diamond, the loss may be considerably less.
Ch. 4: The Cutting of Gems Page of 311 Ch. 5: Imitation Gems & Artificial Production
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