Emerald

"Heb. nophek (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."