שְׁבוּ shᵉbûw (H7618)

a gem (from its sparkle), probably the agate

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

from an unused root (probably identical with that of שָׁבָה (H7617) through the idea of subdivision into flashes or streamers (compare שָׁבִיב (H7632)) meaning to flame;