Exodus 28:11-15

As a jeweler engraves a signet, you shall engrave the two stones according to the names of the sons of Israel; you shall set them in filigree settings of gold.

And you shall put the two stones on the shoulder pieces of the ephod, as stones of memorial for the sons of Israel, and Aaron shall carry their names before the Lord on his two shoulders as a memorial.

And you shall make filigree settings of gold,

and two chains of pure gold; you shall make them of twisted cord work, and you shall put the corded chains on the filigree settings.

“You shall make a breastpiece of judgment, the work of a skilled embroiderer; like the work of the ephod you shall make it: of gold, of violet, purple, and scarlet material, and fine twisted linen you shall make it.