Exodus 28:6-10

And they shall make the ephod of gold, of blue, and of purple, of scarlet, and fine twined linen, with cunning work. It shall have the two shoulderpieces thereof joined at the two edges thereof; and so it shall be joined together. And the curious girdle of the ephod, which is upon it, shall be of the same, according to the work thereof; even 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 one stone, and the other six names of the rest on the other stone, according to their birth.