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Acid testing can be used to determine if a piece of lapis lazuli is real or an imitation. Real lapis lazuli will release a smell like rotten eggs and effervesce. Acid testing is a destructive test and must be done with safety precautions for both the test piece and the gemologist. “Second-lapis-tbs-crystals-side1” by nimbus186 is licensed under CC By-SA 2.0
In some cases, a hot point test will not distinguish plastic …
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