Exodus 28:6-10

“They shall also make the ephod of gold, of blue and purple and scarlet material and fine twisted linen, the work of the skillful workman. It shall have two shoulder pieces joined to its two ends, that it may be joined. The skillfully woven band, which is on it, shall be like its workmanship, of the same material: of gold, of blue and purple and scarlet material and fine twisted linen. You shall take two onyx stones and engrave on them the names of the sons of Israel, six of their names on the one stone and the names of the remaining six on the other stone, according to their birth.