This is a superb example of a Achaemenid rock crystal goblet, beautifully carved with light ribs on its body, a stem foot with more marked spiral ribbings.
The Achaemenid Persian empire was one of the largest empires of the ancient time, extending from Anatolia and Egypt across western Asia to northern India and Central Asia. The Achaemenids produced luxurious objects, and among the most prestigious there are rock crystal vessels.