While perforated in the middle, the onyx doesn't have an actual liquid holding cavity, so it's purpose is entirely decorative.
Dimentions:
Height -15cm
Largest width (handles) - 7cm
Base diameter - 5cm
This item is a typical example of a piece of decoration from the 60's trend of alabaster/onyx interior decor, which at the time used to be a "must have" in the more affluent homes. Depending on how well off a household was, one would see larger and larger items made of onyx in their living rooms.