Ring with emerald
Roman Period
Emeralds began to be mined in Egypt's Eastern Desert already in the Ptolemaic Period, but it's only with the Roman Period they become more common. In the Roman Period they were usually left in their rough hexagonal form.
This swivel-set ring suspends the emerald on a pin passing through two disks hammered at the end of the ring itself. The emerald itself is only very slightly faceted.