Heb. nophek ( Exodus 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 ( Revelation 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."
a precious stone of a rich green color, upon which its value chiefly depends. This gem was the first in the second row on the breastplate of the high priest. ( Exodus 28:18 ; 39:11 ) It was imported to Tyre from Syria, ( Ezekiel 27:16 ) was used as a seal or signet, Ecclus. 32:6, as an ornament of clothing and bedding, ( Ezekiel 28:13 ; Judges 10:21 ) and is spoken of as one of the foundations of Jerusalem. ( Revelation 21:19 ) Tob. 13:16. The rainbow around the throne is compared to emerald in ( Revelation 4:3 )