There are two reasons to apply PVD coatings on glass: To make it with decorative appearance or to make it with functional coatings. PVD technology can be used for high class glass lighting accessories(e.g, crystal lights).
PVD coatings can improve the transparency or reflection rate of the glass.
A hybrid PVD machine with both of MF(medium frequency) magnetron sputtering or arc ion plating technologies are usually used for this application. MF sputtering is the best option for decorative purpose applications. It's reactive sputtering for applying decorative colors.