Solid State ! really

Sheets of glass with a veneer of natural stone backlit by LED's! this is solid state lighting through and through. The light sources are good enough to illuminate the stone and bring out its natural beauty from inside. From the LED Mag article

Lighting designers Chaos Design Consultants have installed an illuminated bar in the atrium of the Hilton Hotel, Heathrow.

Dancer’s Bar consists of 9 panels of a special product consisting of a thin veneer of real natural stone, which is bonded on to glass, the end result being beautiful translucent panels.

In order to produce the "floating" effect required by the client, Chaos installed panels of Prismex behind the veneer of natural stone and then edgelit each panel with a total of 450 white LEDs.
Prismex is an ultra-slim acrylic which makes it ideal to use where space is at a minimum. The acrylic also has a special pattern printed on it, which allows the light to be picked up and evenly spread across the panels.