asteria

noun

as·​te·​ria a-ˈstir-ē-ə 

: a gemstone cut to show asterism

Word History

Etymology

borrowed from Latin, "a precious stone, perhaps a star sapphire," borrowed from Greek astería, feminine of astérios "of a star, full of stars, starry," adjective derivative of aster-, astḗr "star" — more at star entry 1

First Known Use

1816, in the meaning defined above