The exhibition “Pierres Précieuses” with Van Cleef Arpels in Paris (2020) (1)

The four gemstones are ruby, diamond, sapphire and emerald. Ruby and sapphire are corundum stones while emerald is a beryl and diamond is a carbon.

Source : https://www.futura-sciences.com/sciences/definitions/matiere-diamant-3869/

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