The Blue Chart
Tables of Gemstone Identification
A must for gemmolgists, gemmology students or amatuers to aid in the correct identification of gemstones.
The BlueChart is A4 size, printed on card stock (220gr per m3). It has a total of 13 pages with ring binding. (Not laminated).
A compilation of key information for the gemologist:
- to analyze the results obtained with all the standard gemological tools
- to distinguish between natural and treated gemstones, synthesis and imitations
- to avoid traps and potentially misleading results
Gemstones listed by refractive index
- Clear reading of optical and physical data.
- Visual help to point out quickly characteristic features.
- Natural colors are reproduced.
- to identify the gem as natural, synthetic or imitation;
- to recognize possible treatments;
- to prevent misidentification (overlapping values).
Gemstones listed by density.
Density followed by optical data make possible a basic identification of most gemstones
Key information from the other tables will confirm and specify the identification when necessary.
Dichroscope analytical results for gemstones
- Anisotropic stones are listed by colors
- Characteristic pleochroism is described.
Diffraction Spectroscope Analytical Results
Three pages containing the diagnostic and relevant spectrums seen with a handheld diffraction grating spectroscope. Results shown for 79 different gemstones.
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