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It does greatly depend on the shape of the crystal. If it is an unusual shape, this would need a very skilled person to shape it correctly. If it is a regular round shape, these are easier to come by. This UK web site [link in blue] offers watch parts including crystals to give you an idea on prices. I use a vernier to measure the diameter and thickness of the crystal I wish to replace and UV activated glue to fix the replacement crystal in place and one of those UV nail lamps to cure the glue. This should be done in a clean environment and I use finger cots to prevent fingerprints. The whole process takes about 30 to 60 minutes. Any _competant_ watch repair place should be able to help you. At least you know the process now :) Acrylic Watch Glasses Tension Rings Flat Top High and Low Dome
If you have a plastic crystal, you can use plastic polish (I like Novus #2, myself) to buff out small scratches. In a pinch, white toothpaste (not the gel kind) contains gentle grit and also will buff out some imperfections in a plastic watch crystal. Toothpaste is harsher than plastic polish, however, and may remove deeper scratches at the cost of creating some additional fine scratches.
If your watch crystal is made of mineral glass, scratches cannot be easily polished out. In that case, your best solution would be to take it to a jeweler or watch repair facility to have the crystal replaced. Depending on the style of the watch, replacing a crystal can be as little as $15--or run to well over $100 for some diver's watches. If you're not comfortable with the estimate, get another one elsewhere. Crystal replacement is a high profit margin job for many jewelers. Not everyone is equally greedy.
It is possible for jewelers to order exact fit replacement crystals for many watches. However, generic replacements are not made for all watches. If your jeweler cannot perform this service (which may cost as little as $10 for common crystals), ask if the jeweler knows of a jeweler's specialty business that can custom-fit crystals. These small shops custom-grind crystals from blank stock and hand-fit them to your watch. Such companies used to be relatively common; today, most conduct operations via mail-order or exist in large cities like New York where there is enough local wholesale and walk-in business.
Department stores and chain jewelry stores rarely have the on-sight resources to service a broad selection of watch crystals. Seek out an independent jeweler or one that has a "we repair watches" sign displayed.
mcdevito75 here, If the crystal is Glass a replacement crystal may be your only choice, If Plastic It may be saved. Check with the watch repair service directory, right here on fixya. Bottom of this page, click on repair service directory then watches.
Problably not something you should tackle by yourself. I replace them and have experience. You would need to make measurements and order from a place that has inventory. Then you would need to remove case back and movement. Then you would push out the crystal from the inside. The new crystal needs to be installed with the proper "glue". This also needs to be ordered. I suggest you take it to a local watchmaker that knows how to do this. But, best of luck
You need a press or a vice, and (if the crystal is flat) a piece of hard plastic or wood for each side. Then slowly and carefully press down or tighten untill the back "snapps" on. If you have a domed crystal, you will have to find something that will go around the casing, but not hit the crystal and do the tightening. If your watch is different then what I discribed PLEASE let me know and we will think of something just for your watches dementions and crystal type.