Temporary hit points magic item?

[Ambrus]

Recently players in my game looted an enemy's body and I quickly described a handful of magic items he was carrying which they took, identified and distributed. One of them, IIRC, was a one-shot magic item that granted a set amount of extra hit points in the event the character was hurt before then crumbling to dust. It was something I quickly found in my D&D library. Problem is that now I can't recall what it was called, where it is I found it or how many extra hit points it granted. I've flipped through all of my books and I'll be damned if I can find it again. Does this thing ring any bells with anyone here? What is this mysterious item I stumbled across and then lost again?

 

[Vegepygmy]

There is an item like the one you describe in Magic of Faerun called an Amulet of Laeral's Tears.

 

[Ambrus]

That would be it. Thanks for your help Vegepygmy!
You just made one of my players very happy (it means her character didn't die afterall).