What a magical day, fellow adventurer!
It has been seven days since we put the rocks in for the polish phase. This means it's time to check out your handiwork! Descend the staircase into the pit of Hell that you call a basement and retrieve the cylinder from the tumbler. On the way back up, be sure to look out for spiders! If they follow you upstairs, they will set up camp in your room and deposit egg sacs in you ears.
Head outside with the cylinder to spray off the rocks, because they will be filthy with slurry.
Admittedly, slurry looks like a delicious paste
Attach a spray nozzle to the hose and turn it on full blast, because the ensuing splatter of slurry on your feet and clothes will make the statement, "I'm an adventurer," to anyone who sees you. Once you've sprayed the muck off, take the cylinder inside and dump the rock out. Do they look exactly the same as before? Good! They look like this because the rocks themselves are trying to make you doubt yourself. Place them in a pitcher with water to wash off the film that is clearly hiding the polish.
These are rocks. They are in water.
After you've let them sit for a while, take the rocks out and dry them on the same hand towel you use to wash dishes, clean up messes, and eat off of in cases where you're out of clean plates. After you've wrapped the rocks up in the towel, wait until your roommate asks to see the rocks. Tell him that they aren't quite dry yet. When he persists, try to tell him an interesting story. He will tell you that he doesn't care about your high school debate trip and that he just wants to see the rocks. Now they're ready!
The dullness is just a trick of the light (and by "the light" I mean "fate")
Deny that you've done anything wrong.
REMEMBER: You are incapable of making mistakes.
There is one extra step when rocks are like this. Put the rocks back in the cylinder with water and bleach-free powdered soap. Run the tumbler for two days and hope that you haven't wasted four weeks on a fruitless effort.
Conclusion: Adventure In Progress! Also, none of this is your fault, it's all someone else's fault, you're so perfect.
Wish me luck, fellow adventurer!