Exodus 28:9-12

King James Version

⁹ And thou shalt take two onyx stones, and grave on them the names of the children of Israel:

¹⁰ Six of their names on one stone, and the other six names of the rest on the other stone, according to their birth.

¹¹ 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.

¹² 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.