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| The main table of 18 pages is based on refractive indexes. |
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| All necessary information and tips are compiled to clearly identify the gem under test:
Special emphasis on distinctive characteristics of treated, synthetic, and imitation gemstones.
Traps are pointed out.
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| Clear reading of optical and physical data. Natural colors are reproduced.
Colors are widely used to point out quickly specific features such as specific polariscope reactions, possible phenomena, doubling.
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