Blue Chart Gem Identification
Natural / Treated / Synthetic / Imitation
Edition 2015

   The gem identification tables present 144 minerals and are organized by refractif index. With indication of groups, species, sub-species and varieties, refractif index, refractif index range, birefringence & doubling, chrystal system, optic character & sign, specific gravity, specific gravity range, and hardness.
The description of distinctif characteristics, typical inclusions and common treatments, help to eliminate all possibilities but one. They also give you hints which properties to test in order to double check the result.
A description of pleochroism
79 color absorption spectrums as seen with a quality diffraction grating spectroscope. A very quick way to identify several color stones.
Last but not least the specific gravity, combined with the optical properties are very helpful to identify rough stones or sometimes double check cut stones.
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