Le pietre preziose : pietre preziose naturali. Pietre preziose ottenute artificialmente mediante processi chimici. Imitazione delle pietre preziose (pietre false).

In copyright

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Credit

Le pietre preziose : pietre preziose naturali. Pietre preziose ottenute artificialmente mediante processi chimici. Imitazione delle pietre preziose (pietre false). In copyright. Source: Wellcome Collection.