If you buff it it will get shinny I would think. I threw them in the tumbler at work. If you are not familiar with a tumbler it is a big container full of stones with water recirculated into it in small amounts. The whole container vibrates and thus the edges and the surface of said metal, aluminum, is tumbled and thus deburred after a half hour give or take 15 min. Works kind of like the unbalanced washing machine load thing that so many housewifes love so much.
We have even made, small sized ones, to put in a lathe chuck and turned at slow rpm's with the stones and a little water in them with the parts. Kind of like rock polishing tumblers. Kind of like these, but ours are more heavy duty industrial size units.
http://www.thumlerstumbler.com/rotary.html
http://www.thumlerstumbler.com/vibratory.html
Not these
http://www.jessewhitetumblingteam.com/