Diadema is one of a series of designs from the great Venetian glass company, Vistosi, intended to be used in a wide variety of ways – both as standard catalogue items (chandeliers, pendant lights, floor lights, wall lights) and for custom pieces.
It consists of glass rods, as above at Le Tre Gazelle in Milan, where they are forming the spectacular chandelier, as well as the simpler wall lights.
Diadema can be made into simple pendants, like these, for Bulgari in Paris:
Though more often, the rods are of different lengths, as here, in these suspensions over a bar at the Hotel Dorint in Zurich...
...which match the Diadema wall lights there:
Back to a larger scale, here's a Diadema chandelier at the Hotel Regina Baglioni in Rome:
The effect is quieter when two colours are used:
The standard glass colours are clear and topaz (as above). But blue can look very cool – in both senses! – for example.
The images in this post have been taken from the book Vistosi have just published that shows details of some of their installations. You can download a PDF of it here.