Fasten both stones on the shoulder pieces of the ephod as memorial stones for the sons of Israel. Aaron is to bear their names on his two shoulders as a memorial before the LORD.
Jewish Publication Society of America Version (JPS1917) - Exodus 28:12 >And thou shalt put the two stones upon the shoulder-pieces of the ephod, to be stones of memorial for the children of Israel; and Aaron shall bear their names before the LORD upon his two shoulders for a memorial.