Chrysoprase (chalcedony)

Chrysoprase is a rare variety of chalcedony, a microcrystalline form of quartz, characterized by its magnificent apple-green to intense green color due to the presence of nickel.

Considered one of the most valuable varieties of chalcedony, it forms in alteration zones of nickel-rich rocks. Appreciated since Antiquity, particularly by the Greeks and Romans, it is sought after for its luminous color, translucency, and uniform appearance resembling jade.