Exodus 28:6-10

And they shall make the ephod of gold, of blue, and purple, scarlet, and fine twined linen, the work of the skilful workman. It shall have two shoulder-pieces joined to the two ends thereof, that it may be joined together. And the skilfully woven band, which is upon it, wherewith to gird it on, shall be like the work thereof and of the same piece; of gold, of blue, and purple, and scarlet, and fine twined linen. And thou shalt take two onyx stones, and grave on them the names of the children of Israel: six of their names on the one stone, and the names of the six that remain on the other stone, according to their birth.