noun
A noun for the green precious stone. It can modify another noun with の, as in エメラルドの指輪.
彼女はエメラルドの指輪をしている。
She is wearing an emerald ring.
このエメラルドは色がとても鮮やかだ。
This emerald has a very vivid color.
Written in katakana as a foreign-derived term in modern Japanese; no particular borrowing language or history is specified.