emerald

\ \ [13] Emerald traces its history back to an ancient Semitic verb ‘shine’ – bāraq. From this there seems to have been formed a noun *bāraqt meaning ‘gem’. This was taken over into the ancient vernacular languages of India (main source of gems in early times) as maragada-. Greek acquired the word as máragdos ‘green gem’, which was soon superseded as the main form by a variant smáragdos. Latin adopted this as smaragdus (which passed into English, probably via Old French, as smaragd, a term used for the ‘emerald’ from the 13th to the 18th century, and revived as an archaism in the 19th century). In post-classical times Latin smaragdus became *smaralda, and as this became disseminated through the Romance languages it acquired in many cases an additional syllable: Spanish esmeralda, for instance (source of the English forename) and Old French esmeraude, borrowed into Middle English as emeraud.