Glass pearl beads are extremely effective when used with crystal beads. The facets of the crystal are very complementary to the smoothness of the glass pearl beads. In time, the coating of glass pearl beads will wear down. This is more of a problem for the beads that have used a darker surface treatment, as the irregularity will be more noticeable as the surface becomes eroded. The lighter colors will look nicer for longer. For perfect wear, you would have to use actual pearls and a lot of money.