the two stones # 02_EXO_28_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. 
the two stones # 02_EXO_28_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.