The Victoria & Albert Museum
Rock crystal vessels were made for the rulers of Cairo during the Fatimid period (969–1171). These were the work of very skilled craftsmen. Enormous skill and paitence was required to hollow out the raw rock crystal without breaking it and to carve the delicate, often very shallow, decoration. Because of this, these were prestigious items that the ruler would have displayed in his treasury.
These bottles were probably used for storing perfumes—highly costly materials in their own right.