The exhibition “Pierres Pr├ęcieuses” with Van Cleef Arpels in Paris (2020) (1)

This gallery contains 51 photos.

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/