Summer 1999 Gems & Gemology Gem News - GIA

The evolution of the hydration bands in opals with heating will be investigated in the future, as well as data on synthetic opals grown under ...

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play-of-color opal in vesicular basalt from zimapán, hidalgo state - GIA

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LES CAHIERS DE LA SÉCURITÉ INTÉRIEURE Corruption dans la ...

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