From the designer's site:
The number keys are like pieces of pretty quartz crystal (with LED light at the bottom). Once pressed, the key will shine like brilliant jewel. The super large screen, the perfect display of incoming call, and such functions as calendar, phone book and super luxurious speaker phone all add up to the great enjoyment of the home phone luxury.
I believe it's just a concept, but that's one of the most stunning phones I've ever seen. It looks like it'd break at the touch, but the two hours you get to spend looking at it before it does would be totally worth it.