Well, if it is in bad shape because of a lot of scratches, it can absolutely be restored with fine grades of sandpaper and polishing compound. There are many success stories on the forum, with incredible before and after photos. It makes no sense to say it will get worse. If there are internal cracks within the crystal, then polishing won't fix those cracks. It should be obvious to you from looking at the crystal if it is scratched or cracked, so you tell us.
Here is a thread I posted on the topic:
https://omegaforums.net/threads/cry...al-benrus-type-i-content.102629/#post-1341363Click to expand...