Strong's #7618: shbuw (pronounced sheb-oo')

from an unused root (probably identical with that of 7617 through the idea of subdivision into flashes or streamers (compare 7632) meaning to flame; a gem (from its sparkle), probably the agate:--agate.

Brown-Driver-Briggs Hebrew Lexicon:

ּׁ

shebû

1) a precious stone (in the high priest' s breastplate)

1a) probably an agate

Part of Speech: noun feminine

Relation: from an unused root (probably identical with that of H7617 through the idea of subdivision into flashes or streamers [compare H7632]) meaning to flame

Usage:

This word is used 2 times:

 

Exodus 28:19: "And the third row a ligure, an agate, and an amethyst."
Exodus 39:12: "And the third row, a ligure, an agate, and an amethyst."