Where does “Σμαράγδα” come from?

Σμαράγδα (Greek) comes from Greek σμαράγδι, from Ancient Greek σμάραγδος, from Proto-Semitic bariq- — lightning.

Ancestry of “Σμαράγδα”, step by step

Step	Language	Word	Meaning
1	Greek	σμαράγδι	emerald
2	Ancient Greek	σμάραγδος	emerald
3	Proto-Semitic	bariq-	lightning