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Nachahmung, Imitation und Manipulation von Edelsteinen

Nachahmung, Imitation und Manipulation von Edelsteinen
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New yorkUnited statesIdar obersteinRheinland pfalzGemmologe drcStiftung edelsteinforschungGgmbh drcGeorg ottoMinerals orGemmologische laboratorySsef helvetic foundation for edelsteinforschungGemmologisches institute anversGemological institute of americaGemmologisches laboratory austriaCentre for gemmologieGems in the lab