1. This piece of jewelry is an heirloom that has been passed down all the way from my great grandparents.2. This gold hairbrush is our family heirloom, and I will give it to you when you get married.
 (family) heirloom a family possession handed down from generation to generationheirloom = 不一定是值錢的東西, 卻是家家代代傳下來的東西 = 一代傳一代的東西，可說是傳家之寶，但不一定很珍貴a family possession handed down from generation to generation 是白話的說法。
All the wrk I've been putting into this project has been all for nothing because my boss is shutting it down.