Gemstones, A complete color reference for precious and semiprecious stones of the world

Posted on March 1, 2009 by Reviewed by Richard B. Drucker, GG

The book begins with a brief lesson on the technical aspects of gems including definitions of minerals, crystals, gems, metals, and the various properties of gems (R.I., birefringence, dispersion, S.G., hardness, cleav- age, etc.). While…

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