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Ch. 7: Hardness of Gemstones

Ch. 7: Hardness of Gemstones Page of 118 Ch. 7: Hardness of Gemstones Text size:minus plus Restore normal size   Mail page  Print this page
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PRECIOUS STONES
(See also list of stones, arranged in their respective colours, in Chapter XII.)
The method of testing is very simple. A representa­tive selection of the above stones, each with a sharp edge, is kept for the purpose of scratching and being scratched, and those usually set apart for tests in the various groups, are as follows :—
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