carbuncle

Concise Bible Dictionary:

Two Hebrew words are so translated.
Cabochon Carbuncle Garnet

Strong’s Dictionary of Hebrew Words:

Transliteration:
bareqeth
Phonic:
baw-reh’-keth
Meaning:
or barkath {baw-rek-ath'}; from 1300; a gem (as flashing), perhaps the emerald
KJV Usage:
carbuncle

Jackson’s Dictionary of Scripture Proper Names:

I will kindle (only in Isa. 54:12) : lightning stone: (literally she shot forth)