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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).