Exodus 28:11

28:11 You are to engrave the two stones with the names of the sons of Israel with the work of an engraver in stone, like the engravings of a seal; you are to have them set in gold filigree settings.

Exodus 39:14

39:14 The stones were for the names of the sons of Israel, twelve, corresponding to the number of their names. Each name corresponding to one of the twelve tribes was like the engravings of a seal.