Gresso luxury smartphones differ as much from each other as Vertu phones do. The silhouette of the new Gresso Skeleton Gold might also seem familiar, the only significant difference is that on the back there is a window, just as large as the display, which lets us see the handset's circuits, even though in the case of Motorola Aura the mechanics are much more spectacular. The Windows Mobile 6 handset, featuring a 42 karat polished sapphire glass, 18 karats of gold, stainless steel, titanium, ceramics and leather, has 64 MB of internal memory, 2 GB of storage space and only GPRS data transfer support. The luxury phone, being made in 50 copies, will be available for about 4,400 dollars.