Ealdorman of Downwarren's ear is a quest item in The Witcher 3: Wild Hunt. This item normally doesn't appear in the inventory as, soon as it's acquired, the next cutscene takes place and this is removed from the inventory.
It is a left human ear that belongs to the ealdorman of Downwarren, before he cuts it off in tribute to the Crones. Geralt then delivers the ear to The Orphans of Crookback Bog where he places it on an offering stone. Once the Crones appear in their true form, Whispess takes the offering and threads it onto her necklace of ears.