Czech Glas Beads are wllknown for high quality. You will find them in a lots of different shapes and colors, and you will use them for most techniques.
Most of them are in colored glass, these will not change over time. Other have a coating, there are a lots of different coatings, but they will all change, so eventually, on behalf of friction and light and that kind... But if you put the jewelry on after you done your make-up and hair, and take good care of them when you don´t wear them, they will yet look nice for a long time!