σμάραγδος G4665
smáragdos · smar'-ag-dos · Noun Feminine
of uncertain derivation; the emerald or green gem so called:--emerald.
1 Occurrence in the King James Bible
Revelation 21:19And the foundations of the wall of the city were garnished with all manner of precious stones. The first foundation was jasper; the second, sapphire; the third, a chalcedony; the fourth, an emerald;