Columbia subject headings:
Gems--Greece--Exhibitions.
Gems--Rome--Exhibitions.
Glyptics--Greece--Exhibitions.
Glyptics--Rome--Exhibitions.
Harvard subject headings:
Gem carving--Germany--Bonn--Exhibitions.
Gem carving--Greece--Exhibitions.
Gem carving--Rome--Exhibitions.
Seals (Numismatics)--Germany--Bonn--Exhibitions.
Princeton subject headings:
Gems--Greece--Exhibitions.
Gems--Rome--Exhibitions.
Glyptics--Greece--Exhibitions.
Glyptics--Rome--Exhibitions.