IT IS IMPORTANT not to expose Roman glass jewelry to moisture and cleaning liquids. The Roman glass may change in tones or lose some of its iridescent appearances. First of all – Roman Glass itself shouldn’t need any cleaning. Whatever changes it may undergo – it is a natural process and a non-reversible too. The only part of the Roman glass jewelry that may be cleaned is a Sterling Silver, the cleaning should be done with special dry cloth for jewelry cleaning. Cleaning should be done more frequently than with regular jewelry, to prevent the silver from becoming too oxidized (black). This will allow you to be able to clean the sterling silver without the use of the cleaning liquids. Please remember that it took thousands of years for the Nature to transform the Roman glass into the beautiful material you see now. We would highly recommend treating and preserving our jewelry as the unique and valuable item it truly is.