Targum zu Schemot 28:18

And the name of the second row, smaragd, and sapphire and chalcedony; and upon them shall be engraven and expressed the names of the three tribes, Jehuda, Dan, and Naphtali.

And the second row, carbuncle, and sapphire, and amethyst; in writing expressed upon them, the name of the three tribes, Jehudah, Issakar, and Zebulon.