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| Table 1: Gemstones listed by refractive index (18 pages) |
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| Right pages: |
| Detailed information to identify the gem material (natural - synthesis - imitation), to recognize treatments (common - rare - new), to prevent misidentification (overlapping values). |
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| Left pages: |
| Clear reading of optical and physical data. Natural colors are reproduced.
Visual help to point out quickly specific features such as possible phenomena, doubling, polariscope reaction.
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