A giant green stone that glows with an amazing bright light.  Your hands curl around it greedily as if sensing the power hidden inside.  As you run your hands over the stone,  you feel the 'drain' of the power into you ...  Additionally you can 'check' the power.
It is in excellent condition.

Syntaxes:

• drain stone → grants up to 200 gp
• check stone → checks if stone is drained

Source: Quest 247 - Power!