Unfortunately we only have one heirloom in my family; A pocket watch from long, long ago that is inscribed to 'William Donald' and always passed down to the eldest of that name in the family.
My Grandfather was William and, as traditional, named his first son after his father, so my Dad is Andrew. His younger brother was William and got the watch. He was a lot older when he had his son and when he passed on my aunt took care of the watch for Wee William.
It's a wonderful piece and well worth the family care of it.

I know that one thing which will be passed down from me is the Sterling Silver Clan brooch I bought for Diane when we were married. (And possibly the Luckenbooth I got her when we got engaged.)

I often think I'll make a few things for the purpose of passing down but it's a ways off yet and they'll not be as wonderful as CaptMac's or Jock Scot's heirlooms.