This word represents two Hebrew words. The first may he a general term to denote any bright,sparkling gem, (Isaiah 54:12) the second, (Exodus 28:17; 39:10; Ezekiel 28:13) is supposed to be and smaragdus or emerald.
CARBUNCLE
Meaning of CARBUNCLE in English
Smith's Bible English dictionary. Английский библейский словарь Смита. 2012