Exodus 28:13

With the work of an engraver in stone, [like] the engravings of a signet, shalt thou engrave the two stones with the names of the children of Israel: thou shalt make them to be set in ouches of gold.

And thou shalt put the two stones upon the shoulders of the ephod [for] stones of memorial unto the children of Israel: and Aaron shall bear their names before the LORD upon his two shoulders for a memorial.

And two chains [of] pure gold at the ends; [of] wreathen work shalt thou make them, and fasten the wreathen chains to the ouches.

And thou shalt make the breastplate of judgment with cunning work; after the work of the ephod thou shalt make it; [of] gold, [of] blue, and [of] purple, and [of] scarlet, and [of] fine twined linen, shalt thou make it.