If you are the sort of person that replaces your bezels every time they get a scratch, I would advise you to turn around. This isn't going to be pretty.
I have no idea how it happened, but my DW-5030C got a scratch on the crystal. Scratch may not even be an accurate term, it was a small chip that easily caught your fingernail. Thing is, I barely wear this watch. I have probably had it out no more than a dozen or two times since buying it. I actually consider it my "dressier" square to wear to the office. To compare, I wear my GW-5000 like I stole it, sometimes 24/7, and the crystal is pristine. I actually like the rest of the watch wearing-in but deep scratches in the crystal really catch the eye.
I was stuck with either living with the chip, replacing the crystal, or trying to polish it out. I don't like the idea of removing the crystal, it is pressed in with a gasket and isn't meant to be user serviceable, unlike the caseback. I didn't want to cause any issues with water resistance so I decided to polish the crystal.
I immediate realized a problem with this; the case is ion plated. The crystal on these watches is pretty much flush with the case so polishing the crystal means polishing the case, which means goodbye plating. After a bit of thinking I decided that, because it would be hidden under the bezel, I would proceed. G-Shocks are tough as nails and I never have it out of the bezel anyways.
I won't go into the process as it has been well documented before, but it was wet-sanding with increasing fineness of sandpaper before going to diamond paste. I didn't think to take a picture of the scratch.
Here is the watch after 400 grit:
and now 600 grit (actually silicon carbide paper):
(2000 grit picture missing)
and now onto 3.5 micron diamond paste (3000 grit):
2.5 micron (4000 grit):
and 1.5 micro (6000 grit):
I ran out of 1.0 and 0.5 micron paste restoring a DW-6600 so I need to wait until my order arrives to finish it up. It isn't perfectly clear yet and will probably take another couple of hours. With a high polish the case front actually looks kind of cool.
Thanks for reading!