ChristianAnswers.Net WebBible Encyclopedia
(Ex. 28:18; 39:11); i.e., the “glowing stone”
probably the carbuncle, a precious stone in the breastplate of the high priest
It is mentioned (Rev. 21:19) as one of the foundations of the New Jerusalem.
The name given to this stone in the New Testament Greek is smaragdos, which means “live coal.”