A — 1: σμάραγδος
(Strong's #4665 — Noun Feminine — smaragdos — smar'-ag-dos )

is a transparent stone of a light green color, occupying the first place in the second row on the high priest's breastplate, Exodus 28:18 . Tyre imported it from Syria, Ezekiel 27:16 . It is one of the foundations of the heavenly Jerusalem, Revelation 21:19 . The name was applied to other stones of a similar character, such as the carbuncle.

B — 1: σμαράγδινος
(Strong's #4664 — Adjective — smaragdinos — smar-ag'-dee-nos )

"emerald in character," descriptive of the rainbow round about the throne in Revelation 4:3 , is used in the papyri to denote emerald green.