Power

You have the power to determine if a diamond is worth a fortune, or if it's a fake. How you use that power is up to you.

You should probably use it for good and tell people the true value of Great-Aunt Jenny's ring. The alternative will likely result in karma biting you for it in the end.

 
And you thought chemistry was a waste of time. (Source)

You also may have the power to create synthetic diamonds. How cool is that? Say you want to get married but can't afford a rock—just whip up a nice two carat. You gotta love the power of chemistry.