אַבְנֵי־שֹׁ֕הַם וְאַבְנֵ֖י מִלֻּאִ֑ים לָאֵפֹ֖ד וְלַחֹֽשֶׁן׃
onyx stones, and stones to be set, for the ephod, and for the breastplate.
Targum Jonathan on Exodus
gems of beryl that are gems of perfection, for engraving and insertion in the ephoda and in the breastplate.