Gemstones Identification Blue Chart The book is only available in english This chart is a compilation of information indispensable to analyze the results obtained with standard gemological tools such as refractometer, loupe & microscope, dichroscope, polariscope, spectroscope, density scale, UV lights, dichromatic filter. The main goal is to quickly distinguish between natural and treated gemstones, synthesis and imitations. Traps and potentially misleading results are highlighted. Completely Revised and Updated Edition 2012
