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Gemstone Ruby Sapphire etc.

Gemstone Ruby Sapphire etc. Page of 149 Descriptions of Gems: Diamond Text size:minus plus Restore normal size   Mail page  Print this page
IMITATIONS.
53
Some remarks on the artificial colouring of natural stones will be found in chapter vii. ; the different varieties of silica—agate, onyx, cornelian, and even opal—are frequently subjected to processes of heating and saturation with chemical reagents in order to change their hue or to introduce foreign colouring matters.
Gemstone Ruby Sapphire etc. Page of 149 Descriptions of Gems: Diamond
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