[3] It is found in Europe to Central Asia, including the Caucasus[4] even possibly northern Turkey[5] and has also been recorded from North America, where it is an adventive species.

F. fastuosa has a gold shine that transitions to a green or violet-blue longitudinal stripe near the shoulder band of the elytra as well as near the suture.

[7] Adults and larvae of F. fastuosa feed on various plants in the family Lamiaceae, including hemp-nettle (Galeopsis) and dead-nettle (Lamium).

[8] F. fastuosa was formerly classified in the genus Chrysolina, as the only member of the monotypic subgenus Fastuolina proposed by Warchałowski in 1991.

In 2023, a phylogenetic analysis based on DNA extracted from museum specimens recovered "C." fastuosa in a sister group relationship with the genus Oreina.