The Alabaster Chalice is a treasure found in "He Who Tames the Iron Horse" of Sly 2: Band of Thieves. This loot is booby-trapped, allowing a time limit of 45 seconds to be returned to the safe house before it disappears. Once there, it can be sold on ThiefNet for 654 coins.
The chalice features small green diamonds at the base. It is found outside of the cabin owned by the flashlight guards.