noun
treasured article; precious vessel; outstanding person
Literary or formal term for a treasured object or, metaphorically, a person of great worth. The metaphorical sense is less common in everyday speech.
この博物館には古代の宝器が展示されている。
Ancient treasured vessels are displayed in this museum.
彼は我が社にとってまさに宝器だ。
He is truly a treasured asset to our company.
Compound of 宝 (treasure) and 器 (vessel, container). The metaphorical extension to a person of great worth is a natural semantic broadening.