Mirriam-Webster defines:
smaragds
Main Entry: sma·ragd
Pronunciation: \smə-ˈragd, ˈsma-ˌragd\
Function: noun
Etymology: Middle English smaragde, from Latin smaragdus, from Greek smaragdos, of Semitic origin; akin to Akkadian barraqtu gemstone
Date: 13th century
: emerald
Thank you Jack, I have learned something new!!
Slovakia has opal mines in Cervenica, Dubnik and Banske.
Has ungvarite opal - a green opal...
~Cheryl