Due to my location (and I'm a cheapskate) it takes around 2-3 weeks to get a new crystal, hence I have had to develop my acrylic crystal refurbishment skills to revive the original crystals that come with vintage watches and I thought I would share how I do this as I now have pretty good results, assuming the crystal has only scratches and no cracks or chunks missing here is my process: Use 320 grit wet-dry paper over the entire surface of the crystal evenly to remove the deepest scratch