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Table 1:   Gemstones listed by refractive index (18 pages)
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Left pages:                    
Clear reading of optical and physical data                    .
Visual help to point out quickly characteristic features                    .
Natural colors are reproduced.                    
          Right pages:
          Key information: to identify the gem as natural, synthetic or imitation;
                                       to recognize possible treatments;
                                       to prevent misidentification (overlapping values).