I design with glass, so it is highly recommended that you remove your jewelry over a soft surface such as a bed or carpet. The dichroic coating on the surface of the glass is permanent, elements like water, the sun or even chlorine would NOT remove the dichroic coating. The only thing that could harm the glass is by scraping or dropping it onto a hard surface. The glass will be preserved for years to come!
Pendant bails are Sterling Silver plated and zinc and nickel free. As with any metal, over time, it can oxidize. If you expose your pendant bail to excessive perspiration or chemicals the plating could wear off the bail part. Please remove your pendant during any type of exercising or sports. You may apply a mild cleaner with a cotton swab and then rinse. Do not use a harsh cleaner on the bail. Use a rubbing cloth if needed. I have been fusing glass for over 10 years now and my very first pieces look just like my favorites today.