A pyramid of carved and polished Hematite.    Hematite is a great stone for grounding and is also a protective stone.  Hematite's nature is to bring us back to equilibrium.  A crystal pyramid can be used to draw off negative energy.  A crystal pyramid can also be used to enhance and focus the properties of the stone.
 
Approximately 7/8" - 1 1/8"
From India.