bāreqet בָּרֶ֫קֶת ‘gem’ (Hebrew)

Etymology^?: from bāraq בָּרַק ‘to use lightning / lightning’
Roots: ברק
Variants: בָּרֶ֫קֶת, בָּֽרְקַת

bāreqet n, f
1) a gem, precious stone, emerald (Josephus)