Targum zu Schemot 28:17

And thou shalt fill it with a fulness of precious stones: four rows of precious gems, answering to the four regions of the world. The first row, carnelian, topaz, carbuncle; and on them shall be engraven and expressed the names of the tribes Reuben, Shemeon, and Levi.

And thou shalt fill it with a filling of stones, four rows of precious stone; the first row, carnelian, and topaz, and carbuncle; written with expression upon it (shall be) the name of the three tribes, Reuben, Shemeon, Levi.