They've been in families for generations

Usage examples of heirlooms.

Devereux heirlooms from our strong room, where they have been kept since your mother died, and hand them over to your Countess once you are married?

To restore it to its original position as the greatest of the Devereux heirlooms would simply have meant that its reappearance and its disappearance would have had to be accounted for, and the scandal would inevitably have been revived again.

Tempting people to sell off the family heirlooms so Planir can investigate them, letting idiots like me involve themselves in your daft schemes?

Burndy had been quite cooperative whenever a reward was offered for stolen heirlooms and jewelry, returning a portion of the goods to a fair-minded detective in return for some of the cash.