Exodus 28:13

Six of their names on the one stone, and the names of the six that remain on the other stone, in the order of their birth.

With the work of an engraver in stone, like the engravings of a signet, you shall engrave the two stones, according to the names of the children of Israel. You shall make them to be enclosed in settings of gold.

You shall put the two stones on the shoulder straps of the ephod, to be stones of memorial for the children of Israel. Aaron shall bear their names before the LORD on his two shoulders for a memorial.

and two chains of pure gold; you shall make them like cords of braided work. You shall put the braided chains on the settings.

“You shall make a breastplate of judgment, the work of the skillful workman; like the work of the ephod you shall make it; of gold, of blue, and purple, and scarlet, and fine twined linen, you shall make it.

It shall be square and folded double; a span shall be its length, and a span its width.