Treasure: something valuable and cherished (a precious object, or metaphorically a beloved person or thing).
彼女は古い箱の中に小さな宝を見つけた。
She found a small treasure inside an old box.
子どもたちは公園で宝探しゲームを楽しんだ。
The children enjoyed a treasure-hunt game in the park.
家族は私にとってかけがえのない宝だ。
My family is an irreplaceable treasure to me.