Exodus 28:13

11With 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.

12You 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.

13You shall make settings of gold,

14and two chains of pure gold; you shall make them like cords of braided work. You shall put the braided chains on the settings.

15“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.