A Fatimid Caliphate-era ewer carved from a single piece of rock crystal. The Treasure of Caliph Mostansir-Billah at Cairo, which was destroyed in 1062, was said to have contained 1,800 rock crystal vessels. But the ewer you see here is one of only seven (creatively called the Magnificent Seven) known to have survived til today.
Circa 1000 - 1050 CE.