Fetching details from the dictionary...
treasure; treasured item; prized possession
これは私の大切な宝物だ。
This is my precious treasure.
家族は一番の宝物だと思う。
I think family is the greatest treasure.
子供の頃に集めた宝物が押し入れから出てきた。
Treasures I collected as a child came out of the closet.