prized possession

Translations
драгоценное владение
His car is his most prized possession.
Его машина — его самое драгоценное владение.
Definitions
A prized possession is an item that someone values highly and considers to be of great importance or significance, often due to its sentimental value, rarity, or personal meaning.
Words
prized

adjective
ценный
possession

noun
владение