All About Magnetism and Transparency in Gem Stones

there are four class divisions of transparency which are transparent, semi-transparent, translucent, and opaque and the most valuable precious stones are generally transparent

There are but few precious stones that possess the power to act on the magnetic needle; among them are the chrysolite, cinnamon stone, almandine, pyrope, and garnet.

TRANSPARENCY.

Precious stones are, on the basis of their relative transparency, divided into four classes, as follows: Transparent, or admitting light freely and clearly; defining objects when used as a lens. Semi-transparent, admitting light, but only partially defining objects. Translucent, admitting light faintly. Opaque, not admitting light.

The more valuable precious stones, excepting opals and turquoises, are generally transparent.


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